We have two AppleTVs with remote controls, all purchased in late 2014. One of the devices has worked well as long as we've owned it, while the second stopped responding to the remote control after several months of use. I've tested both remote controls and confirmed that the battery levels are fine and the I/R sending units are functional. When the AppleTVs were installed, they were connected to our home network which had a Linksys router as the Wi-Fi unit. In early 2015, we upgraded to a shiny, new Apple Wi-Fi router. I seem to recall that both AppleTVs worked for at least a while after this upgrade. Some of my problem shooting steps: I have unpaired the remotes from the functional AppleTV, paired one of the remotes, and confirmed that the unpaired device causes the light on the front of the AppleTV to flash 3 times in rapid succession. Afterwards, I have tried using both remotes on the nonfunctioning Apple TV. The light on the front of the Apple TV doesn't respond to either remote; it's as if the receiver has been disabled or stopped working. Help!