This thread has been very useful. I've had freezing/lost/0 byte files for years since I got my 24/96- they replaced the unit and problem remains. Has anyone narrowed down the parameters that may or may not cause it? I seem to have it occur more at .wav file settings as opposed to .mp3- but battery or AC makes no diff. Anyway was able to recover 9mins of a set and though is only a fraction is still meaningful. Thanks everyone for your time and effort. I think this year will be time for a new recorder.
Make sure you have the latest firmware. It should solve the problem.