Just FYI... I completed a system image earlier and allowed avast to update as normal. Once it updated the pop ups started again.
I just completed another system image and prevented avast from updating and the pop ups are non existent. Looks to be a false positive from avast.
Im currently deep scanning with emsisoft, malwarebytes and avast... we'll see if anything alerts, I'll then update avast and see if it triggers again.