I have a similar issue using my wireless Panasonic surround system. If I have the system turned on I get disconnected from my bluetooth headset for my cell phone within about a minute or less. Some of my notebooks also have intermittent connectivity to my Wi-Fi network when placed between the receiver and the transmitter.

I found that changing channel I have my wireless router set to it will also cause my wireless surround sound system to lose connectivity.

It might be worth a shot to disable all other wireless devices including the Wi-Fi to make sure that it isn't a combination of wireless signals causing your controller disconnect.