A500-ST6622 shuts off (completely dies) without warning

My Satellite A500-ST6622 purchased in Nov. 2009, running Windows 7 with all updates, has run flawlessly until a few days ago. Twice in the last three days while using the laptop, which was plugged into the AC outlet (it is plugged in 100% of the time), the computer instantly and completely shut off without warning. It does not shut down or crash, but completely dies as if the power source were instantly removed.
The first time it happened I tried to restart the computer by pressing the power button but the unit again went dead (completely shut off) during boot up. Next I disconnected the the AC power adapter, removed the battery briefly, reinserted the battery and booted up the computer without a problem. The computer operated without problems for three days, then went dead again.
Any idea what would cause this?
Thanks for any assistance.
Greg Tomerlin
Lebanon, TN

Thats like a old issue. happens on quite a few Satellite models. Happened to mien too. Sent mine in for repair many times and always came back with the problem reappearing after one or more days. Taking a month to "repair" each time, my labtop warrenty ran out and its stuck with this same stupid issue. (I also had to send it in a few times because of Toshiba's failture to reseat everything(like the cd drive and usb ports) properly so that wasted more time). Toshiba has never sovled this issue and its a pain in the buttk. Dont' think Toshiba can even fix it either. Eventually you won't be able to turn on your computer(shuts off doring POST). The problem worsens over time and Toshiba can't fix it. I'd say I barely got ot use my labtop for like 90 days out of the whole year of warrenty. Hardware Failure is a common problem in Toshiba Satellite computers

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