I was using a second pair of goggles with my friend the other day (3rd person observer) but found they only maintained a connection for somewhere between 500 and 1000 feet then they would go blank. Returning would allow them to reconnect. Has anyone else experienced this? I haven't had time to trouble shoot this or look at which freq they might be using While they worked it was find but disconcerting to have them blank out at such a short range.