I have a wireless controller driving five units. They all stopped at once. I'm proud of my solution.
With my wife watching the controlled lights, I turned off house breakers one at a time. Finally, on breaker 22, the system came back. It turned out to be a very small CFL lamp (13W) always on in the downstairs hall. As it aged, it must have been producing lots of bad RF. Replaced that bulb and I'm back in business. I'm sure others must have done this before but I'm happy to have done it. Bob