I had one do this. I took it apart and found that the connection between the two circuit boards inside had broken loose. There is one small board that is the RF receiver. It is connected to the main IR board by a three-prong connector. The connecter itself acts as a support as well as one plastic stand-off. Aparently, the connector on the IR board broke loose from its soldering. I tried to repair it, but after a few failed attempts, I gave up and bought a new one.

- RUDENEY