I have , what amounts to a testing environment, and I had the GW1000s, and the GW1100 side by side off a USB supply. I mean, this is like a usual AC power strip that has 3 USB ports fed off a 600VA UPS. I moved the GW1100, out of that arrangement , to a spot 3 feet away, and , I know longer have the issue with it dropping out .
Frankly, might be the interference from the other units that are like inches away , or something completely different.
LOL, this is for fun, the UPS is a APC 600VA. and it has a USB port which is where I moved the GW1100 to (it is 3 feet away), but, as I have learned that port is not fast enough on switching over or not supplying power during an outage . ( no this is not the monitoring port that I also have connected, but a separate one on the unit).