I was having the same issues as mentioned in this post - I know its a bit old now but I've only recently become a user of UnRAID.
I re-packaged the sorccu container with a script which will connect to the androidtv/firetv devices automatically and attempt to keep them connected. Its nothing fancy but it works for me.
Its here if it will help anyone else with these issues: https://hub.docker.com/r/barnybbb/adb-hass-androidtv
Thanks,
Barny.