Can someone PLEASE explain how to get my PVR to stay on?? I loose the signal after 45-60 seconds and the TV screen goes blank. I try and retry to get a channel to stay on but it will NOT. So far this morning, I have tried at least 20 times and unplugged the unit. This MYSTERIOUS machine does this periodically. Will someone PLEASE explain it?? This has happened NUMEROUS times since purchasing a SHAW PVR... just one of the MANY things this POS machine has done. Thank You so much.