Ghost in the T10 - switches on & off by itself!

[Koritsu]

Here's the problem my t10 developed just after a year of ownership:

After switching on the T10, the touch-screen would not respond - like it was in lock mode ...but no lock symbol on the display. After switching on & off a few times the touch-screen would eventually respond, then the unit would turn itself off after a couple of minutes, even though it was fully charged.

Now it sometimes takes up to 30 minutes of switching on & off to get the touch-screen to function. It also keeps turning itself on when it is switched off , like it's possessed! Really annoying because after a full charge the battery is flat after 8hrs even when it's turned off to the lock position.

YP-T10JAB/XSA 4GB 2007/10
MTP 3.06 usa firmware

I suspect the problem lies in the on/off switch. Has anyone else had this problem and are there any solutions?