This what happened to me a couple of day ago:
I was out on a big tour of caching and already found a few caches. My batteries were low so I decided to swap to new ones. After turning on the device again (Oregon 550) it told me there were no geocaches???? The rest was working fine. I tried to turn it on and off a couple of times but nothing worked and I had to return home! Hooked the device up to the PC and checked and found all the files in the folders?? Took the device out and tested again, still no caches, like they were just not loaded?
I deleted all the caches and loaded them new and now it is working again?
Question, does anybody know what could have happened here? I am afraid of losing them again during the next trip.
Interesting detail: A colleque cacher called me yesterday to tell me she had the same issue with the same device!! Only she was lucky enough to get them back after a couple of times turning on and off the device.
I can also confirm that I load most of my caches by pocket querries and that I wasn't exceeding my cache limmit as far as I know