My M-10 was purchased in late June. Records fine.
Intermittent (i.e. not every time) loss of clock setting when:
1) sitting on a shelf with good NiMH batteries, in powersave/standby
2) sitting on a shelf turned off
3) when batteries removed and reinserted (least common)
4) after sitting <off> all night with AC cord connected (this AM)
5) after completing an upload or doanload via USB to a W-XP computer
I called Sony today (one of the longest voice mail runarounds I have ever had, with endless hold, hangups, etc._
eventually referred to the proper number which is
1-800-883-6817
which is "product operations support center" for pro gear
you will end up using <5> and then <1> as your voice-tree routing selections
I spoke to a friendly and apparently reasonably knowledgeable person. He said
1) the Li-ion battery stores ALL the settings, not just clock, so if the other settings are not lost, it probably isn't the battery.
2) the commands to control clock setting, retention, and readout are part of the EPROM, which may be the source of the problem
3) if there is something wrong with the clock oscillator that might be a prob. source
They have no current knowledge of or fix for the problem, as noted above. I told him they will be hearing about it from a bunch of other people, so I hope other users will add to the population of reported problems
The service rep suggested I send it in with proof of purchase and written description of the problem (no RMA is necessary)
to
Sony Service Center
123 W. Tryon Ave.
Teaneck, NJ 07666
He said they might replace the main circuit board, if they can't find and fix the problem, or else fix it and send it back with the original circuit board.
Turnaround time right now is about 7 days, but of course they have to make the problem occur first.
Regarding warranty, I was told that if the unit is physically submitted to them for service, and a problem case started while under warranty, then usually they will extend the warranty period to cover the time until it is fixed effectively.
Since the unit still records fine, and I don't know how long they will take, it's frustrating to be without it, but the rep suggested taking care of it ASAP rather than waiting for some kind of official recognition of the problem.
I will wait a few days to see if anyone else has a solution from SONY, and then send it in.
TG