[Mauzen]

Model preview textdraws are counted as sprite textdraws when it comes to limits, and you may just have 100 sprite textdraws created for each player (even created textdraws that arent shown are counting). All sprite textdraws that go above the 100 limit arent shown. I had the same problem once, and so decided to destroy/recreate model and sprite textdraws instead of just hiding them.

That would be the most probable cause of your problem i think.