Even if more than one talk group is active as long as none of them get channel grants simultaneously the G5 will never lose signal and will scan between the talk groups without any issue. I think what often happens, when the signal drops after a transmission, is the radio resumes scanning immediately, often before a reply, and when the radio detects the channel grant for the reply, another talk group becomes active at that exact moment leading to the radio losing signal for 5 seconds. I'm not sure if anyone observes this behavior when scanning in priority talk group scan mode. I only have non-priority talk group scan lists programed.