My 735XT is on the most recent firmware. When I connect to my PC, before it ishows up as a USB device on the computer or in Garmin Express, it reboots and all the data for the day is wiped (and the clock changes time). So far, the only way round this I have found is to use Connect via Bluetooth for syncing and charging the device using a power-only USB socket. Is there anything that might be causing this?