said by buzzmag:
Speed still at approx 30Mbps.Tried various speed sites via wired and wi-fi with same results. Decided to do a rest with the battery removed but to my surprise, Comcast didn't install a battery in the TG862. Rest didn't help. So far, no increase via power-cycle or reset.
Have you tried a Hard Reset using the small button in the back of the modem, hold it down for 10 or 15 sec and release it that should work if it doesn't then tell Comcast.
»www.arrisi.com/support/d ··· d1-3.pdf
here's guide to that modem go to Troubleshooting and go down to page 48, click on Resetting the Router to Factory Defaults it should be in blue, after you clicked on that you should be on page 45 then start reading the guide about hard reset of your TG862G modem.