Maria,
YES, I've had a tremendous amount of trouble with this starting earlier this year.
Prior to that I never had to check "remember me" and I stayed signed in always. Speaking of which I always use private browsing so the history isn't saved. (Yes, my wife knows of my dressing and that I belong to the site.)
However; since I started using "remember me" I stayed signed in.
Why the change? I have no idea. I ain't a tech geek. I wear a pocket watch and use a burn phone.
Love,
Linda W.