Connectivity issues

Hello all. Been awhile, but im having an issue and I always get the best help here.Well... My connection is acting odd all of the sudden. It will stay o for awhile (10 min or so), It will then pop of for a small 2 secs and come back on again. It messes up certian things I might do such as video or webpage display. I can tell its losing connection because I see the little x in the bottom right hand corner. When I first ran diagnostics I was told to insert a cable, (Already one there)- So I then unplugged the modem/router combo and restarted the pc (visa) Now It wants mee to keep on reseting the network adapter wich doesnt work. ARGH.... I have a modem hooked to a router hooked to my pc..... Any help would be great!