macbook randomly asking to be shut down

hi, I've searched the forums if it was posted before but apparently nobody has a similar problem...

first of all, I have to say that this is a really interesting problem. my computer is randomly showing me the thing "are you sure you want to shut down your computer now", like the shut down button was pressed, with exactly the same options (restart - sleep - cancel - shut down). but the problem is, I don't press the shut down button and it works fine when it's pressed. the problem is annoying. it's not happening frequently, but when it starts, it just keeps asking me again and again and again. I don't know whether it's total random, but once, when I scrolled up with two fingers, it was asking the question. another time, it asked me that when I put my two fingers at the same time on the trackpad. now, for example, it seems ok whatever I do, but suddenly it starts asking it again. and once it turned my computer off without me confirming.. and the real stupid thing was, once, my computer was turned off and standing on my table even without the power cord, and guess what, it just turned itself on !! I didn't do anything and saw my computer turning itself on...

is there anybody experiencing the same problem ? any suggestions ?

thanks--


p.s. some info: white macbook, was bought in august'06, all the updates are done, no windows, and yes I'm experiencing the bluetooth problem as well