Macbook Pro trackpad partly stops working after 1 touch

I have a very strange problem with the trackpad on my macbook pro (late 2008, fully updated, SSD, 4Gb).

When a mouse is used all is fine. WHen I touch the trackpad ONCE, it will stop working correctly, it will:

- not detect a single click

- will detect a doucle click

- mouse moving (one or two fingers) no problem

IF the SMC is reset (unplug/remove battery/hold power button 5 sec/put battery back/ plug in power/start up)

all is ok, BUT after 1 time use the trackpad the same appears.....

I have sofar tried:

- SMC (described)

- PRAM reset

- disk utility (recover/fault detect)

- restore from time machine

- Yasu

nothing new is configured, the only thing i can imagine is that I moved the mac, while it was running, from its place and walked away from the place were the connected bluetooth mouse was located.....

anyone any clue?