eTrex suddenly "erases" tracks or parts of tracks
Tracks are on, show on map, usually are displayed fine. The settings and performance are the same as our Oregon 400. However, on the eTrex, while you're out in the woods, part or all of your track will just disappear. You could be 2 miles into the woods with nothing showing behind you, when previously you had your whole route from home to the woods displayed . Zooming in and out does not help. This is a problem since we like to use those tracks to backtrack and make trail maps for the next trip. Nothing seems to cause or prevent this behavior(possibly navigating to a new waypoint or geocache, but we do that so often it's hard to attribute that to the cause). We don't always notice right away that they have disappeared. The tracks are never "full" and I've reset them anyway. I would say 25% of the time we have a problem with the entire track suddenly being incomplete or gone entirely. What can we do?