Safari keeps signing me out of google accounts

For a few weeks now every time I am surfing the web or I wait till the next day, I will randomly be logged out of all of my gmail accounts on safari. I have to regularly switch between at least 3 different google accounts for my work and for school and it is starting to become incredibly frustrating to deal with. I've updated my mac book, I've cleared all cookies, I've tried everything I think and I can't seem to just stay singed in. There are times that I will sign in, and 15 minutes later after switching back to google from some webpage, I am signed out again. Someone, please help SOS.