Restart message reappearing after restart

I did an update of Avast IS over the weekend, and since then, the message “Avast needs to restart your computer” has been popping up a couple of times an hour, even though I have shut down the computer two or three times since then. It does not stop coming back when I select “next century” or “tomorrow.” It also appears upon startup.

Bug?

OS is Windows 10.

Avast 2016: Repair and reset Avast Antivirus >> https://www.avast.com/faq.php?article=AVKB204#artTitle

Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204
If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf