Public bug reported:

Description: A few times an hour the networking drops for around 20
seconds. It then automatically reconnects. The only clearly related
message in journalctl is the DHCPREQUEST / DCHPACK followed the
messages:

Starting Network Manager Script Dispatcher Service...
bound to X.X.X.X -- renewal in 1692 seconds.
[system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Started Network Manager Script Dispatcher Service.
req:1 'dhcp4-change' [wlp2s0]: new request (1 scripts)
req:1 'dhcp4-change' [wlp2s0]: start running ordered scripts...

That makes me think that Network Manager silently died and was
restarted.

Notes:
* The system is a new Dell Precision 5520 with a Qualcomm Atheros QCA6174 
802.11ac Wireless Network Adapter (rev 32)
* This system started as a clean install of Ubuntu 18.04 Beta on March 31, 2018
* The wireless networking was stable from install until a system update on 
April 27, 2018
* The wired networking is completely stable.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: network-manager 1.10.6-2ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu May  3 10:36:25 2018
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2018-03-31 (32 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180331)
IpRoute:
 default via 10.4.0.1 dev wlp2s0 proto dhcp metric 600 
 10.4.0.0/20 dev wlp2s0 proto kernel scope link src 10.4.3.151 metric 600 
 169.254.0.0/16 dev wlp2s0 scope link metric 1000
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=false
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE           TYPE      STATE        DBUS-PATH                              
    CONNECTION  CON-UUID                              CON-PATH                  
                         
 wlp2s0           wifi      connected    
/org/freedesktop/NetworkManager/Devices/3  Evernym     
c5f3aef0-8286-4268-a8e4-7b7272491d34  
/org/freedesktop/NetworkManager/ActiveConnection/1 
 enx1065308d9647  ethernet  unavailable  
/org/freedesktop/NetworkManager/Devices/2  --          --                       
             --                                                 
 lo               loopback  unmanaged    
/org/freedesktop/NetworkManager/Devices/1  --          --                       
             --
nmcli-nm:
 RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI  
   WWAN-HW  WWAN     
 running  1.10.6   connected  started  full          enabled     enabled  
enabled  enabled  disabled

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1768912

Title:
  Wifi connection drops regularly

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