Everything is going missing!

Everything is getting lost, no matter what i put in my sims inventory. also animals like goats and sheep that have been purchased disappear from the game. its getting really difficult to play the game. i cant even plant plants either because it wont let my sim plant anything. there's a huge gameplay issue within sims and its drawing me away from wanting to play the game. its really frustrating because i have spent so much hard earned money on this game just for it to be unplayable.  i have all the expansion packs and majority of the game packs and kits. This needs to be fixed immediately.