I'm interested in kleiner Rainer's post. I'm having the clock issue at the moment, which started after a period of a few months without using the device (when I first got it I used it more often and never had the problem). I can leave my device plugged in over the weekend to see whether anything improves.
My question is whether I should leave it plugged in with the unit switched on or off. Which do we think will allow the internal battery to recharge?
EDIT: I re-read his post and it seems (correct me if I'm wrong) that he was saying that the internal battery charges when it is being used either on battery power or on mains power, and that when the unit it switched off then the internal battery is not charged. Furthermore, he says that it might be the case that the internal battery takes quite a long time to recharge.
I'm going to leave mine on sleep mode over the weekend and see whether I still get the "set clock" when I bring it out of sleep mode on Monday. At the moment I'm getting "set clock" every day so this would tell me whether the internal battery is draining while the unit is sleeping (as opposed to being switched off).
If the internal battery is being charged while on sleep mode then presumably it should be fully charged at this point (over 60 hours from now) so I will then try leaving the recorder switched off (not sleeping) for a week or so and see whether I still get "set clock" when I turn it back on.
Currently I'm not using the recorder much and am switching it on from time to time to keep a record of occurrences of "set clock" in order to keep Sony tech support informed. Hence I can use my unit to investigate kleiner Rainer's "educated guess" for which I thank him very much. If we can understand the problem we can hopefully work around it.
I'll share any findings on here.