Whonix-WS-AppVM overload doesnt response to shutdown

[TNT_BOM_BOM]

keeping whonix working over one day, overload TBB with browsing as well. will hang on the shutdowning stage and keep asking either to kill it or to wait 20 seconds

cc @Patrick

Ticket:

Issue: Whonix-ws-Appvm overload doesnt respond to shutdown