Thank god at least someone has this issue too. I was starting to get desperate as this seemed to only happen to me. I couldn’t find anything on Google either. Really strange. I haven’t considered reinstalling the OS as having to reboot every seven days isn’t that big of a deal for me but if it works out for you please tell me, and I’ll do it too!
Edit: maybe it’s a problem with the RAM stick… do you happen to know what model and brand yours is?