What indications are you getting that a full scan is going on ?

As You may know (or not) AVG, is now a part of Avast Software.

There is no setting in avast to run a ‘Full Scan’ I don’t know if you have made any changes to avast, so I would suggest ‘Saving your current settings’ (avastUI > Settings > General, scroll down to the bottom of the screen) and then use the Restore Factory defaults (avastUI > Settings > Troubleshooting, scroll down to the Restore Factory Defaults).