I have a 3com NBX100, I have noticed for the pass couple of weeks users are being disconnected from the system. This seems to happen in the afternoon at about 12 noon. When I connect the system to my laptop it works, when I dial into the system all is well, I have checked to see if there is any device on the network that may be using the IP address and none was found. Is there a way to check why this could be happening.