Did you update your devices for the new Extended Daylight Savings Time? The first deadline has passed, but if your devices are not updated, they are going to change the clock automatically when the original daylight savings time date arrives!
HandHeld Products has posted the CAB files for the Extended Daylight Savings Time update. Put the correct CAB file (PocketPC 2003 or Windows Mobile 5) in the \IPSM\AutoInstall and cold-boot the device. Be sure you have backed up all data on the device before cold booting!