There is going something strange with few buttons on my device. From one second to another my escape-, zero- and trackball-ok-button do not work correctly.
When I press escape it gives me 'hl', zero=yi, ok=uo

I restarted it, pulled the battery, even wiped it and put my last backup on it and still have the failures.

Can anybody help me out?!

Sounds like the device got some moisture in the keyboard.

Yep, sounds just like what happened with mine when I got a little too aggressive cleaning the trackball with windex. Thankfully a little time allowed it all to dry out and get back to normal. And I finally figured out how to properly clean my trackball (though I'll probably just replace it nexts time it gets gnarly).

That sounds somehow great, thought it is busted
Well, I give it a time and put it on warm places.

Thanks