Thought that ARC disconnection was solved

As @ged_hickman1 wrote below, version mismatches might cause this

In other cases and even without version mismatches, “Poor Connection” messages even on home wifi and although ARC setup works in principle can usually be fixed by resetting the ARC app from Home > Settings. Sometimes, an uninstall/reinstall of the ARC app is necessary.

However, you will lose any downloads in ARC in either case.

This seems to happen sometimes after updating: