Optonline / Can anybody help?

I just returned from vac. (Aruba was great) and my optonline has stopped working. reading the trouble shooting guide it said unplug the modum for a couple of mins. and then plug back in. When I tried this it started working again...BUT it goes back out again in apx 2-5 mins. When Its plugged back in all the lights go on but then the first light to go out is the one that says pc activity then others go out and Im right back in the same boat. Any ideas? Thanks. (PS worked great before vacation)