I work in an ISP firm but my nightmare has been the consistent browsin even when all the lights on the modem are on.i have made a thorough check on my LAN everything was okay(not Virus/Worm issue).Occasionally,i have to connect the modem directly with a cross cable to my laptop to narrow it down but the problem is still there(not browsing) but the main thing that baffles me is that the i can ping any DNS address and still get a good reply.Then I discovered that at anytime the browsin freezes and i power off the modem and power on again for it to reboot,it automatically starts browsing again untill after some time the problem occurs again even with rx,tx & net lock in order.

Please what are the possible reasons for this problem.
and what can i do