I have this problem, unless I kill the process avast. What to do?
If you use Avast Pro or AIS, backup your license file first.
What about the removal utility for Avast, cleaning
ALL previous versions you ever had by running it for each one? Use Windows Safe Mode directly for better results.
After that, manually search for any hidden folders containing the words "avast" and/or "alwil" and delete them too.
Then install the latest stable version 6.0.1367 (please download anew), reboot and test for a couple of days (at least) before getting to any new conclusion about the 6008 event ID issue.
You would need to configure Avast again, and if you have files in the chest they will be gone too.
Of course, I can't guarantee you if this would solve the problem, but at least it gives you a clean base line.
Please report back.