Sims 4 freezes every time I have to choose something from the sim's inventory.

@charljhyde  There was a patch a week ago that might have broken one or more mods or cc that you've been using.  So the first thing to try is to move your Mods folder to your desktop, delete localthumbcache.package, and see whether the game still freezes.  Don't worry about the effect of removing your cc—this is just for testing, and you don't have to save your progress.

If that doesn't help, please start a new save and test the same functions on entirely new sims.