AutoRemote Connection refused after some hours

I am using Tasker/AutoRemote for several years to run on a Samsung Galaxy Tab 2 to work as a wall display in my home automation. Basically when a motion is detected then it turns on the display.

This worked for some years and recently I updated the apps on my tablet. Since then I have the problem that after a couple of hours (about once a day) my home automation cannot establish a network connection any longer to the AutoRemote running on the tablet. The connection fails with "Connection refused".

When the problem occurs then I can use tasker to start AutoRemote again and instantly the problem is fixed.

This is what I tried:

• Configured Android to not apply power saving on AutoRemote
• Installed app to keep Wifi enabled -> the tablet is always pingable
• Uninstalled/Stopped all unused apps to have as much RAM free as possible (like 200 MB free now, should be fine I guess)
• When the problem occurs I can still see "AutoRemote" in the list of running processes

I suspect the problem got introduced by the latest Tasker and/or AutoRemote updates (well, I didn't install updates for like 2 years). Are there somewhere old version available so I could install them to test if this is the root cause?

Any other ideas are very appreciated, thanks!