Sony HXD870 recorder will not work properly following Freeview Channel Change

[Billiemill]

Help, my Sony HXD870 recorder will not work properly following the Freeview channel change. I retune it but the new channels are not there and when I turn it off and on again it needs completely retuned again as all the channels have disappeared. 

I deleted the junk, switched off, switched on, blank screen, no channels. Retuned, all deleted channels back. When I retune everything goes back the way it was before the freeview channel change e.g. BBC News is channel 130. When I try channel 231 I get a message this channel not in use. When I turn off and back on again blank screen, no channels, need to retune again. Have tried retune and easy set up with same result.
I am stumped.

[DerekG54]

Will factory reset clear the hard drive as well?

[Mooly01]

All HDD content is preserved when doing a factory reset.