Pfsense crashing

[cdpace]

Hello i have pfsense 1.2.2 installed and what is happening is that after like 20 min or 30 min pfsense seems to crash. The computer that pfsense is installed on dosent hang it still lets me choose commands etc. but all the terminals that are connected to the switch that is connected to the firewall will loose there connection. I then have to restart Pfsense and wait some time until i can connect again. What do you think the problem is guys?

[Cry Havok]

Faulty hardware.