Model Precache Overflow - Help please!

Hey so ive owned Civil Gamers for like a year now mabye and we now get about 90 players a day wich causes a strange crash where the model precache table overflows, this happens about 2 times a day and ive looked everywhere and hired developers and everything but we have had no luck with making any progress with a fix, i was wondering if anyone could help me fix this or atleast point me in the right direction? mabye to a person who may be able to work with me to fix it? Thanks in advance!

You have too much models on your server for your server PC or the srcds to handle.