There was this one time my game froze and when i tried logging back in it said password incorrect so I went to SE account management and changed the password and it worked fine.

I have yet to transfer my account to any of the new payment options though. It's unlikely but thought i should mention it since that seems to be the difference other than game freezing between our two situations.

Just make sure your POL password is correct in addition to your SE account password. (I hate that they both exist at the same time when clearly the SE account password supersedes the POL password by virtue of the fact that you have to type it in every time)

If i somehow mistook your predicament (which let's face it this stuff is more complicated than it should be) then i apologize but having said that I hope what i said helps.