Do the first thing that should always be done (because of crappy code) unplug the power to the receiver wait 20 seconds.. plug it back in, and wait 5 minutes to see what happens.
While unplugging the wireless dongle would allow the dongle itself to lose power and reset, that doesn't take care of what the receiver does, or the code it sets up and runs. And even though they go through a soft power reset usually every morning.. its not the same as full power loss.
After that, if its still not working report back let the boards know..