I am seeing the occasional WIN 10 stall and it appears to be related to AVAST.
User hive is loaded by another process (Registry Lock) Process name: C:\Program Files\AVAST Software\Cleanup\TuneupSvc.exe, PID: 2332, ProfSvc PID: 1836.
User hive is loaded by another process (Registry Lock) Process name: C:\Program Files\AVAST Software\Avast\AvastSvc.exe, PID: 4048, ProfSvc PID: 1836.
User hive is loaded by another process (Registry Lock) Process name: C:\Windows\System32\svchost.exe, PID: 2964, ProfSvc PID: 1836.