Hi guys, i'm new on this forum. I've just bought my x800 friday. I experience the same problems. Random reboots. I think i've found the solution. I found that sometimes when I pushed hardly the device on the top of the right it started to reboot. I thought it was a problem with the battery not connecting well. I opened the back of the x800 while it was running and it goes instantly off. In fact there is a little push pin in a little hole that turn off the device if you remove the battery cache. So i put a little paper in it. The paper must be placed in a way that the device can turn on even if the battery cache is removed. I replaced the battery cache and know no mor reboots. I hope it will work fr you. Here is a picture where to put the paper : (IMG:http://perso.numericable.fr/~pbeuvelet2/x800.JPG)