Hello,
recently (probably after updating to 17.4.2520 / 17.4.3482.0), AvastUI often become unresponsive (taskbar icon stop amoebing, right-click taskbar icon does not work etc.) after running a few days.
I uses Avast Business Security (Basic / Free) on Windows Server 2008 SP2 32bit.
I made a process dump of frozen AvastUI.exe process so if you want a dump I'll upload it.
Edit: typo