Using latest version, I ran a full scan, it stopped on a SVC file and was stuck there for 30+ mins so I ran a repair, rebooted and tried again.
Second time, it got stuck on a SVC file again and the scan wasn't continuing so I did a clean install.
Even after a clean install and 3 reboots the full scan gets stuck on SVC files - see image attached.
I have created a memory dump of AvastSvc when it was stuck for more than 20 mins.
If anyone from the avast team needs the dump, just let me know.