I also got the same problem with the modem hanged (4 lights on) after using it for a few hours. I only started using this modem after my Aztech router died from adapter failure. I think the problem with the riger modem is that it overheats after prolonged use. Nothing to do with BT cos it hangs even though i'm not using P2P. I'll try to apply a fan underneath the modem. Will let you guys know if it solves the problem.