Another thought if the problem persists, it is just possible that the Hard Disk Drive in the unit is nearing its end of life. I had a similar problem in the past with Sky+ boxes that had the same symptoms as you are experiencing. Had to replace the dive in the end.
There are some windows based programs available for PC that will enable access to the PV-9200T unit to enable copying / backup of recordings etc in the event of having to replace a Hard Disk.
Take a look at:
http://humaxdisk.wikispaces.com/HumaxRW
Might be worth using this to check / see if the disk iresonds and s readable ok.