I'm having the same problem, but until I read your post, I had no idea CAVS was causing it!
Don't be mad that I feel glad to find someone has got the same problem as mine, finally.
After the last post I began to notice that the CAV is still a product in lab.
I turned to the famous red umbrella, Avira Antivir, which is a little disturbing with its frequent ad shows.
But it works well.