Interesting. I figured it was a WIFI thing needing a satellite. Still, I'm surprised more folks haven't experienced this. Figure I'm pretty typical. EEZ tire says they're good to @ 53 feet wo a booster and I'm probably @ 40, tandem axle to cab. No Booster. Would think my receiver placement would be OK because we can drive for hours & they work fine. It tends to happen after we've driven 4 or 5 hours. That could be a clue. But again what’s so weird with mine is that (without changing a thing) they will work for hours go blank and start working again hours later. Aggravating. I just double checked the batteries and they are all just above 3 Volts.