My Belkin n1 router disconnects from telstra every 2 hours - exac

I have an N1 Belkin router and have 2 Macs connected to it. It doesn't seem to matter if there are 1 or 2 computers connected, or if they are connected wired or wireless. We play MMPOLGs and the router seems to disconnect or reset exactly every 2 hours - usually reconnecting within a second or 2. I am using the latest firmware. I have checked all settings on my Bigpond and also on the router and can't find any reason for the disconnects. This is VERY frustrating. I've used the computer on other networks and don't have this problem.