Hello michelleferg! Uninstall the Avast Add-on known as AOS, because it has issues as of late. Guess we have to wait for a permanent fix from Avast Team for this issue to be resolved.
Only way to uninstall AOS is via add/remove by right click Avast, click on change, uncheck the browser protection, and it will uninstall it for u. After it has uninstalled restart your computer manually!
Uninstalling the AOS won’t affect your computer security as the Avast! Web Shield will protect your computer from online malware threats.