Repeated loss of bandwidth affecting neighborhood?

My neighbors and I are experiencing drops of our internet connection repeatedly and resetting the router does not help.  Chat is useless.  Please explain what else we can try.  My router is only 4 months old and it is rented from Comcast and we've had 3 technicians here in the past 3 months... someone mentioned it might be a regional problem (a node issue), but no outages are reported on the Comcast site.