I have also had this problem with my 40d8005
It started by giving me bad recordings. and giving me some strange error massages in danish when I tried to play the bad recordings. (the dansih translation is very bad worse than google translate). I then changed to english to get an idea on what the error message was about. Now all of a sudden almost none of my recordings were playable. It gave me a DRM error. I the changed the langauge back to danish and now I was unable to access my hdd.
I gave up and reformatted my hdd as the tv suggested.
I can only say, stay away from this tv if you need a good implementation of the PVR feature. (The PVR feature on the tv also has other issues)