Can't log in to my account in launcher or game but can on the Sims 3 Store

abistasiasims  I guess that's a good thing overall, and perhaps the problem was something in temp files that Windows reset or replaced after a certain amount of time, like how browser cookies expire.

The "serious error" issue has its own master thread here:

[Current Issue] Sims 3 "serious error" when loading save | EA Forums - 8322938

The problem is usually OneDrive, and there are instructions on how to deal with it in the first post.