Default [Q] loss of service sgs3

Wandering if anybody else has had this problem? When I flash to newer paranoid builds, most recent being 4.3 beta 1, my signal is always fine. As long as I'm at home anyways. When I leave and get so far down the road my signal, all bars dissapear just the empty triangle are left. I can't seem to figure out what the problem is but I was wandering if anyone had any advice or the same problem