Virtual keyboard decalibrated, focus lost - mechanical or software failure ?

Hi,
please test your virtual keyboard in maemo for calibration.
I perform touch screen calibration from time to time
and in the recent time noticed problems with virtual keyboard
getting decalibrated, loosing focus

When I select right part of a "space" bar focus goes to letters in 1st row
Space works ok if selected left part of "space" key .
For 1st row of letters (right part) selected are letters from 2nd row
and so on.

Calibrated screen again and no chance.

I noticed the problem running web browser , trying to enter new
web address using virtual keyboard

So clicking a space bar
got , . / ? selected
clicking . selected l
clicking . can select either l or ; ,
it depends if I click upper left or right

v b n, g h j ,
work ok

Decalibrating this part of the screen in virtual keyboard app
is really much worse than
viruses, trojans in Windows

Any idea, solution, hint ?

(don't move this question, as problem is general, not particular model specific )