signing in have to change password every single time

I don't know what the major malfunction is, but every time I go to sign in I have to make a new password. Even if I was just online viewing my account or doing anything with it. If I happen to be away from the computer a bit too long I'm signed out and when I go to sign back in once again I need to reset my password. This has been going on at least a couple of months now. It's the same if I try to sign in using my phone.

I'd appreciate a solution as it does get to be rather annoying.

Thank you so much for any and all help