The Avast Repair is an early step, however you haven't said what avast version you are using ?
The latest avast version is 18.3.2333, if you haven't got that, that should be your first step as the versions in the topic title wouldn't be resolved by a Repair.
The avast repair in many cases this fixes minor issues, next step would be a) ensuring you have the latest avast version and b) a clean reinstall if the update didn't resolve it.