ASTRX Twinstar II Receiver

Does any one have experience with this receiver?

The receiver has locked up - no response to any key presses on the unit itself or the remote control. The symptoms are:

1. When switched on the four column LED ladder display operates for about 20 -30 seconds then a 'dErr' message appears.

2. The display on the TV is just the word 'Digital' surrounded by a graphic. This display occurs approximately every 5 seconds.

3. When switched off then the display simply shows the elapsed time the receiver has been operating.

I have tried to reload the software, which appears to go smoothly, but the problem persists.

Any ideas please.