CAI 302 date problem

I flew yesterday (26 October) and had two hours, later I used the
Cambridge utility on my PDA to download the flight log from the
Cambridge 302.

First thing I noticed was that the utility said the flight was 111
hours long, and that the date of the flight was 21 October.

I later checked the log file in See You and it thinks it was 21 Oct.
also.

I then noticed that I had not reset the date in my PDA after replacing
the battery a few weeks back, it thought it was 2002.

However I can't see how the date in the secure .igc file could or
should be affected by that.

The only other thing I can think is that when I last flew (17th Oct ),
I flipped the master switch off rather than doing an orderly shutdown
on the 302.

Any ideas?