Netgear Modem Keeps Shutting/Cable light off
 

Hey guys i hope this is the right place but I have netgear CMG814 router and when im xbox live i usually stay one for 30 to 1hr 30min then i disconnect from xbox live. i have to usually wait 2 minutes then for the cable light to turn on this especially happens when im on forza 2 usually when i join i suddenly just disconnect. I also notice when i dissconnect my router shuts off. please help. this is really making me mad. btw sorry if i posted in wrong place, 1st post. :(