core: Asuswrt stops working after a few hours

Home Assistant release with the issue:

0.85.1

Last working Home Assistant release (if known): NA

Operating environment (Hass.io/Docker/Windows/etc.): Docker

Component/platform: https://www.home-assistant.io/components/asuswrt/

Description of problem:

This component only works for a few hours, but after a while it fails so It will leave all the devices as not_home. It’s worth noting that it works temporarily after HA restarts.

“The first fix after the new component was released worked for several days.”

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

asuswrt:
  host: 192.168.2.1
  username: xxxxx
  password: xxxxx

Traceback (if applicable):

2019-1-05 06:45:39 WARNING (MainThread) [homeassistant.components.device_tracker] Updating device list from asuswrt took longer than the scheduled scan interval 0:00:12
2019-1-05 06:45:52 WARNING (MainThread) [homeassistant.components.device_tracker] Updating device list from asuswrt took longer than the scheduled scan interval 0:00:12
2019-1-05 06:46:05 WARNING (MainThread) [homeassistant.components.device_tracker] Updating device list from asuswrt took longer than the scheduled scan interval 0:00:12
2019-1-05 06:46:13 ERROR (SyncWorker_15) [homeassistant.components.sensor.command_line] Command failed: head -5 /home/homeassistant/.homeassistant/.HA_VERSION
2018
2019-1-05 06:46:18 WARNING (MainThread) [homeassistant.components.device_tracker] Updating device list from asuswrt took longer than the scheduled scan interval 0:00:12
2019-1-05 06:46:31 WARNING (MainThread) [homeassistant.components.device_tracker] Updating device list from asuswrt took longer than the scheduled scan interval 0:00:12
t took longer than the scheduled scan interval 0:00:12
2019-1-05 06:46:57 WARNING (MainThread) [homeassistant.components.device_tracker] Updating device list from asuswrt took longer than the scheduled scan interval 0:00:12
2019-1-05 06:47:10 WARNING (MainThread) [homeassistant.components.device_tracker] Updating device list from asuswrt took longer than the scheduled scan interval 0:00:12

Additional information:

Reference #18735 and #19031

Router: AC-86U latest Merlin firmware installed (384.8_2)