Garmin 800 upload question

Hi!
About 4 weeks ago I purchased a Garmin 800, yes it's a bit quirky and sometimes the backlight won't go on etc..the past few days it's stopped finding my workouts. Whenever I start a ride I hit the timer when I leave, hit the timer off when i'm done. It's just so weird, I went out today, and it only found my ride from yesterday. Has anyone had this problem? Any suggestions on how to fix? I've searched other cycling forumns and I have read that it can be quirky but losing my workouts :-(

Thoughts?

Do you hold the reset button down at the end of your trip so it saves the data?