Save My Router!!

Well, I bought a cheap wireless router, and now I paid the price.
I decided to make a server, and now my router "locks up" every half an hour. If I restart it, it works perfectly. My current Setup:

Internet -> Modem -> Router Wireless Connected Wiredly to Server and wiresly to others

I have tons of hubs and switches, can I do anything?

I have ZyXEL HS-100/HS-100W for router, and Motorola SB5120.

lol, update its firmware, worked for mine.
sorry i cant help that much, thats my only
suggestion