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Just found solution to problem at https://www.sony-europe.com/discussions/message/692349#692349
Be sure to have the latest fw installed (1.24). After that reset your recorder and unplug it from power for 1 minute.
I have the same recorder and I have lost the tuning for the third time in a couple of weeks. Because this means that it fails to record programmes, it is a serious problem, It was fine until the digital switchover - is there a connection?
I have reset the recordert and so far so good. I would be interested to know how I know what firmware is runnning and how to install a new version if required.
Just found solution to problem at https://www.sony-europe.com/discussions/message/692349#692349