@Julian - As no one seems to be doing that, I'll take the initiative and
give you the information instead.

(1) add -vv to networkd_dispatcher_args= in /etc/default/networkd-dispatcher 
and restart it?
(2) include the output of networkctl list

Output of networkctl list:

$ networkctl list
IDX LINK             TYPE               OPERATIONAL SETUP     
  1 lo               loopback           carrier     unmanaged 
  2 eth0             ether              routable    configured
  3 eth1             ether              routable    configured
  4 docker0          ether              no-carrier  unmanaged 

4 links listed.


All log items surrounding the incident with -vv enabled:

Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('OperationalState'): 
dbus.String('no-carrier', variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_370')
Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: WARNING:Unknown 
index 70 seen, reloading interface list
Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Performed 
interface scan; state: <Dispatcher({'iface_names_by_idx': {1: 'lo', 2: 'eth0', 
3: 'eth1', 4: 'docker0', 69: 'veth3a1259f', 70: 'vethb90b319'}, 
'ifaces_by_name': {'lo': NetworkctlListState(idx=1, name='lo', type='loopback', 
operational='carrier', administrative='unmanaged'), 'eth0': 
NetworkctlListState(idx=2, name='eth0', type='ether', operational='routable', 
administrative='configured'), 'eth1': NetworkctlListState(idx=3, name='eth1', 
type='ether', operational='routable', administrative='configured'), 'docker0': 
NetworkctlListState(idx=4, name='docker0', type='ether', 
operational='no-carrier', administrative='unmanaged'), 'veth3a1259f': 
NetworkctlListState(idx=69, name='veth3a1259f', type='ether', 
operational='off', administrative='unmanaged'), 'vethb90b319': 
NetworkctlListState(idx=70, name='vethb90b319', type='ether', 
operational='no-carrier', administrative='unmanaged')}, 'script_dir': 
'/etc/networkd-dispatcher:/usr/lib/networkd-dispatcher'})>
Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: DEBUG:No change 
represented by operational state 'no-carrier' for interface 'vethb90b319'
Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('AdministrativeState'): 
dbus.String('unmanaged', variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_369')
Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: DEBUG:No change 
represented by administrative state 'unmanaged' for interface 'veth3a1259f'
Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('AdministrativeState'): 
dbus.String('unmanaged', variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_370')
Jan 09 19:10:04 lb-plentiful-reservoir networkd-dispatcher: DEBUG:No change 
represented by administrative state 'unmanaged' for interface 'vethb90b319'
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('AdministrativeState'): dbus.String('linger', 
variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_369')
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Path 
'/etc/networkd-dispatcher/linger.d' does not exist; skipping
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Path 
'/usr/lib/networkd-dispatcher/linger.d' does not exist; skipping
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignoring 
notification for interface NetworkctlListState(idx=69, name='veth3a1259f', 
type='ether', operational='off', administrative='linger') entering state 
'linger': no triggers
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('OperationalState'): dbus.String('carrier', 
variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_370')
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignored state 
'carrier' seen for interface 'vethb90b319', skipping
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('OperationalState'): dbus.String('routable', 
variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_34')
Jan 09 19:10:05 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignoring 
notification for interface NetworkctlListState(idx=4, name='docker0', 
type='ether', operational='routable', administrative='unmanaged') entering 
state 'routable': no triggers
Jan 09 19:10:06 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('OperationalState'): dbus.String('degraded', 
variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_370')
Jan 09 19:10:06 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignored state 
'degraded' seen for interface 'vethb90b319', skipping
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('OperationalState'): 
dbus.String('no-carrier', variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_370')
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignoring 
notification for interface NetworkctlListState(idx=70, name='vethb90b319', 
type='ether', operational='no-carrier', administrative='unmanaged') entering 
state 'no-carrier': no triggers
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('OperationalState'): dbus.String('off', 
variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_370')
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignoring 
notification for interface NetworkctlListState(idx=70, name='vethb90b319', 
type='ether', operational='off', administrative='unmanaged') entering state 
'off': no triggers
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('AdministrativeState'): dbus.String('linger', 
variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_369')
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: WARNING:Unknown 
index 69 seen, reloading interface list
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Performed 
interface scan; state: <Dispatcher({'iface_names_by_idx': {1: 'lo', 2: 'eth0', 
3: 'eth1', 4: 'docker0', 70: 'vethb90b319'}, 'ifaces_by_name': {'lo': 
NetworkctlListState(idx=1, name='lo', type='loopback', operational='carrier', 
administrative='unmanaged'), 'eth0': NetworkctlListState(idx=2, name='eth0', 
type='ether', operational='routable', administrative='configured'), 'eth1': 
NetworkctlListState(idx=3, name='eth1', type='ether', operational='routable', 
administrative='configured'), 'docker0': NetworkctlListState(idx=4, 
name='docker0', type='ether', operational='routable', 
administrative='unmanaged'), 'vethb90b319': NetworkctlListState(idx=70, 
name='vethb90b319', type='ether', operational='off', 
administrative='unmanaged')}, 'script_dir': 
'/etc/networkd-dispatcher:/usr/lib/networkd-dispatcher'})>
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: ERROR:Unknown 
interface index 69 seen even after reload
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('AdministrativeState'): dbus.String('linger', 
variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_370')
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Path 
'/etc/networkd-dispatcher/linger.d' does not exist; skipping
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Path 
'/usr/lib/networkd-dispatcher/linger.d' does not exist; skipping
Jan 09 19:10:11 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignoring 
notification for interface NetworkctlListState(idx=70, name='vethb90b319', 
type='ether', operational='off', administrative='linger') entering state 
'linger': no triggers
Jan 09 19:10:12 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Signal: 
typ=dbus.String('org.freedesktop.network1.Link'), 
data=dbus.Dictionary({dbus.String('OperationalState'): 
dbus.String('no-carrier', variant_level=1)}, signature=dbus.Signature('sv')), 
path=dbus.ObjectPath('/org/freedesktop/network1/link/_34')
Jan 09 19:10:12 lb-plentiful-reservoir networkd-dispatcher: DEBUG:Ignoring 
notification for interface NetworkctlListState(idx=4, name='docker0', 
type='ether', operational='no-carrier', administrative='unmanaged') entering 
state 'no-carrier': no triggers

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https://bugs.launchpad.net/bugs/1775131

Title:
  Ubuntu 18.04 networking issue (connection drops after approx. 15
  minutes)

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