I`m running Ubuntu 12.04 updated till today (20 Jun 2014 ) and aswell Debian 
Testing with 
KDE updated and I have the same trouble the network is not working after a 30 o 
45 minutes; I can not restart the network so if I wanna have the network 
running well I must restart the machine.
May some one help me please?

Syslog:
May  9 16:44:10 pcdebian kernel: [ 2071.820186] via-rhine 0000:00:12.0 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
May  9 16:44:20 pcdebian kernel: [ 2081.820185] via-rhine 0000:00:12.0 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
May  9 17:00:16 pcdebian kernel: [ 3037.820197] via-rhine 0000:00:12.0 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
Kern.log:
May  6 12:35:48 pcdebian kernel: [ 1383.808509] via-rhine 0000:00:12.0 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
May  6 13:26:54 pcdebian kernel: [    0.822714] via_rhine: v1.10-LK1.5.1 
2010-10-09 Written by Donald Becker
May  6 13:26:54 pcdebian kernel: [    0.823126] via-rhine 0000:00:12.0 eth0: 
VIA Rhine II at 0x1f200, 00:19:db:a0:d6:13, IRQ 23
May  6 13:26:54 pcdebian kernel: [    0.823905] via-rhine 0000:00:12.0 
eth0: MII PHY found at address 1, status 0x786d advertising 01e1 Link 
45e1
May  6 13:37:07 pcdebian kernel: [  625.820368] via-rhine 0000:00:12.0 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
May  6 13:37:17 pcdebian kernel: [  635.820197] via-rhine 0000:00:12.0 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
Ubuntu kern.log
May  5 19:28:54 caralu74 kernel: [  451.136479] device eth0 left promiscuous 
mode
May  5 19:29:01 caralu74 kernel: [  458.572040] device eth0 entered promiscuous 
mode
May  5 19:36:50 caralu74 kernel: [  926.820645] via-rhine 0000:00:12.0: 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
May  5 19:36:50 caralu74 kernel: [  926.821393] via-rhine 0000:00:12.0: eth0: 
link up, 100Mbps, full-duplex, lpa 0x45E1
May  5 19:36:54 caralu74 kernel: [  930.820180] via-rhine 0000:00:12.0: 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
May  9 16:00:02 caralu74 kernel: [ 5408.820181] via-rhine 0000:00:12.0: 
eth0: Transmit timed out, status 1003, PHY status 786d, resetting...
####### ####### ####### #####
And this could be useful:
May  6 16:13:53 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 
67 interval 7
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <warn> (eth0): DHCPv4 request 
timed out.
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <info> (eth0): canceled DHCP 
transaction, DHCP client pid 2876
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <info> Activation 
(eth0) Stage 4 of 5 (IPv4 Configure Timeout) scheduled...
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
4 of 5 (IPv4 Configure Timeout) started...
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <info> (eth0): 
device state change: ip-config -> failed (reason 'ip-config- 
unavailable' ) [70 120 5]
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <warn> Activation (eth0) failed.
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
4 of 5 (IPv4 Configure Timeout) complete.
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <info> (eth0): 
device state change: failed -> disconnected (reason 'none') [120 30 
0]
May  6 16:13:58 caralu74 NetworkManager[ 1568]: <info> (eth0): deactivating 
device (reason 'none') [0]
May  6 16:13:58 caralu74 avahi-daemon[1468]: Withdrawing address record for 
fe80::219: dbff:fea0: d613 on eth0.
May  6 16:13:58 caralu74 avahi-daemon[1468]: Leaving mDNS multicast 
group on interface eth0.IPv6 with address fe80::219: dbff:fea0: d613.
May  6 16:13:58 caralu74 avahi-daemon[1468]: Interface eth0.IPv6 no longer 
relevant for mDNS.
May  6 16:14:00 caralu74 avahi-daemon[1468]: Joining mDNS multicast 
group on interface eth0.IPv6 with address fe80::219: dbff:fea0: d613.
May  6 16:14:00 caralu74 avahi-daemon[1468]: New relevant interface eth0.IPv6 
for mDNS.
May  6 16:14:00 caralu74 avahi-daemon[1468]: Registering new address record for 
fe80::219: dbff:fea0: d613 on eth0.*.
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Auto-activating 
connection 'Conexión cableada 1'.
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) 
starting connection 'Conexión cableada 1'
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> (eth0): 
device state change: disconnected -> prepare (reason 'none') [30 40 
0]
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
1 of 5 (Device Prepare) scheduled...
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
1 of 5 (Device Prepare) started...
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
2 of 5 (Device Configure) scheduled...
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
1 of 5 (Device Prepare) complete.
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
2 of 5 (Device Configure) starting...
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> (eth0): 
device state change: prepare -> config (reason 'none') [40 50 0]
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
2 of 5 (Device Configure) successful.
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
3 of 5 (IP Configure Start) scheduled.
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
2 of 5 (Device Configure) complete.
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
3 of 5 (IP Configure Start) started...
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> (eth0): 
device state change: config -> ip-config (reason 'none') [50 70 0]
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation 
(eth0) Beginning DHCPv4 transaction (timeout in 45 seconds)
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> dhclient started with 
pid 3078
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) 
Beginning IP6 addrconf.
May  6 16:14:01 caralu74 avahi-daemon[1468]: Withdrawing address record for 
fe80::219: dbff:fea0: d613 on eth0.
May  6 16:14:01 caralu74 avahi-daemon[1468]: Leaving mDNS multicast 
group on interface eth0.IPv6 with address fe80::219: dbff:fea0: d613.
May  6 16:14:01 caralu74 avahi-daemon[1468]: Interface eth0.IPv6 no longer 
relevant for mDNS.
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
3 of 5 (IP Configure Start) complete.
May  6 16:14:01 caralu74 dhclient: Internet Systems Consortium DHCP Client 
4.1-ESV-R4
May  6 16:14:01 caralu74 dhclient: Copyright 2004-2011 Internet Systems 
Consortium.
May  6 16:14:01 caralu74 dhclient: All rights reserved.
May  6 16:14:01 caralu74 dhclient: For info, please visit https:/ /www.isc. 
org/software/ dhcp/
May  6 16:14:01 caralu74 dhclient:
May  6 16:14:01 caralu74 NetworkManager[ 1568]: <info> (eth0): DHCPv4 state 
changed nbi -> preinit
May  6 16:14:01 caralu74 dhclient: Listening on LPF/eth0/ 00:19:db: a0:d6:13
May  6 16:14:01 caralu74 dhclient: Sending on   LPF/eth0/ 00:19:db: a0:d6:13
May  6 16:14:01 caralu74 dhclient: Sending on   Socket/fallback
May  6 16:14:01 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 
67 interval 3
May  6 16:14:02 caralu74 avahi-daemon[1468]: Joining mDNS multicast 
group on interface eth0.IPv6 with address fe80::219: dbff:fea0: d613.
May  6 16:14:02 caralu74 avahi-daemon[1468]: New relevant interface eth0.IPv6 
for mDNS.
May  6 16:14:02 caralu74 avahi-daemon[1468]: Registering new address record for 
fe80::219: dbff:fea0: d613 on eth0.*.
May  6 16:14:04 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 
67 interval 6
May  6 16:14:10 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 
67 interval 8
May  6 16:14:11 caralu74 kernel: [  199.096013] eth0: no IPv6 routers present
May  6 16:14:18 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 
67 interval 20
May  6 16:14:21 caralu74 NetworkManager[ 1568]: <info> (eth0): IP6 addrconf 
timed out or failed.
May  6 16:14:21 caralu74 NetworkManager[ 1568]: <info> Activation 
(eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
May  6 16:14:21 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
4 of 5 (IPv6 Configure Timeout) started...
May  6 16:14:21 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
4 of 5 (IPv6 Configure Timeout) complete.
May  6 16:14:38 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 
67 interval 7
May  6 16:14:45 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 
67 interval 15
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <warn> (eth0): DHCPv4 request 
timed out.
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> (eth0): canceled DHCP 
transaction, DHCP client pid 3078
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> Activation 
(eth0) Stage 4 of 5 (IPv4 Configure Timeout) scheduled...
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
4 of 5 (IPv4 Configure Timeout) started...
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> (eth0): 
device state change: ip-config -> failed (reason 'ip-config- 
unavailable' ) [70 120 5]
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> Marking connection 
'Conexión cableada 1' invalid.
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <warn> Activation (eth0) failed.
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> Activation (eth0) Stage 
4 of 5 (IPv4 Configure Timeout) complete.
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> (eth0): 
device state change: failed -> disconnected (reason 'none') [120 30 
0]
May  6 16:14:46 caralu74 NetworkManager[ 1568]: <info> (eth0): deactivating 
device (reason 'none') [0]
May  6 16:14:46 caralu74 avahi-daemon[1468]: Withdrawing address record for 
fe80::219: dbff:fea0: d613 on eth0.
May  6 16:14:46 caralu74 avahi-daemon[1468]: Leaving mDNS multicast 
group on interface eth0.IPv6 with address fe80::219: dbff:fea0: d613.
May  6 16:14:46 caralu74 avahi-daemon[1468]: Interface eth0.IPv6 no longer 
relevant for mDNS.
May  6 16:14:48 caralu74 avahi-daemon[1468]: Joining mDNS multicast 
group on interface eth0.IPv6 with address fe80::219: dbff:fea0: d613.
May  6 16:14:48 caralu74 avahi-daemon[1468]: New relevant interface eth0.IPv6 
for mDNS.
May  6 16:14:48 caralu74 avahi-daemon[1468]: Registering new address record for 
fe80::219: dbff:fea0: d613 on eth0.*.
####### ####### ####### ####### ####

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