My new N810 from Buy.com also suffered from the power on/off enigma, however when I first got it, the unit was great for the first few days. Now I am a newbie at this tablet, but I love it and the issue only developed when I was loading on tons of applications and figuring things out for myself, and although I have read the forums weeks before receiving my unit I am still learning.

Once this issue popped up I at least had a reference for it, and how I fixed mine was I flashed to the newest version (which was already on the device) and now it works 100%. That tells me it was software based and not hardware or firmware causing the issue. I have seen some people post different issues, but this is my experience. This is not me saying this is the cause, simply what I have been a witness too.

I hope this might help someone out there who has this issue, the apps I was loading on that might have caused this were wireless tools and or aircracks to try my unit out at getting some access point access around where I work. Nothing bad just want to see how long it would take and if it would be worth it doing so when I travel around (I am sure this would depend on the encryption, WPA vs WEP and so forth). I was going to flash it anyway after I had some time playing with it, at least I know I can always go back and it is nothing permanent on my unit. Hope this helps someone out there .