Does anyone know how to solve this?
Well, I do not think it should be caused by cheats. Yes save games can become corrupt, but it is not very usual.
Mods/cc could be a reason though. If this happens often enough, I would try removing all of them to see if the game works better.
For example, move the mods folder from C:\Users\Username\Documents\Electronic Arts\The Sims 4 to your Desktop and start the game.
The only 100% sure way to know if it is a mod problem, is removing the mods, starting a new save to make sure nothing is corrupt, and test the game. With a problem like yours that is very time consuming, but it's the only "fireproof" way.
You should also delete the localtumbnail.package from C:\Users\Username\Documents\Electronic Arts\The Sims 4\
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