Recently my RDR-HXD870 has a fault whereby it is losing all programme channels. You can replace them but they are immediately lost at the next power off (even with mains still on).

I have tried a factory reset bit fault persists.

Sometimes the clock has stopped running but that is probably due to its backup battery discharging.

I have seen this problem raised elsewhere on the internet, but no solution has been provided..

It is not helpful not being able to record a broadcast programme whilst watching another channel on the TV.

(I have never updated the firmware and do not see this fault as software, most likely hardware or backup battery - if one used).