In the past few weeks I have noticed that I at some point in the day Google sites stop working. I cannot search using the address bar and I cannot visit any Google site. If I clear the cache and the cookies everything starts working again for a few minutes to a few hours.

This happens both on Mac and on PC. As you can understand this is not a usable scenario. The workaround of clearing the cache and cookies every time this happens is not a solution since it means I need to login into all the sites I was logged in before clearing the cache and cookies. Also this only happens on Firefox and not other browsers.