I had trouble loading game from start. After spending endless time calling origin support , seeing ridiculous and unreasonable massages about origin, finally started working. But it didn't lasted more than couple months. Forgive me, but I didn't pay those money for game and expansions just so I should spend all my time figuring out why origin doesn't work each time around, when I want to play. I'm not playing or buying anymore any games related to origin either.
what sims game is not working? sims 2, 3 or 4?
Any reason what make it work couple month ago? have you updated origin, try to repair the game or remove possibly mods u may have?
If u need always sign up again u can turn on and option in origin that origin doesn't sign u out if u close that client
If you need more help head over to AHQ: https://answers.ea.com/t5/Technical-Issues-PC/bd-p/The-Sims-4
Businesses are getting super suspicious about signing ins, even on Amazon I have to enter my id again, after signing on, if I want to go into my account and my online shop keeps giving my endless spot the car, traffic lights again and again! (There was an Origin update last week 7th March, trying to sort out these problems according to simsvip.com)
Considering you solved your issue I'm going to close this and move it to the archive.