Try to use DigiFix from http://www.copera.com/download.html
zDigitizer from http://www.PalmGear.com
This problem is Hardware problem.
It is from Digitizer Connector.
You can repair it with yourself.
by this page http://www.mrpalm.com/getcontent.php3?tid=94
(Sorry , that information in thai, but I can tell you each picture)
Picture 1:is how to open the glue from Case of Vx
use Hair Styler (Hot Wind)
Picture 2-13 : step by step
Picture 12: is Just try to Hotsync .. when no case.
Picture 14-15: Digitizer Connector ...... Just pull out and plug in again.
other picture is to close case.
in that web , he use new glue to close
but you can use Hair Styler to make old glue , hot and can close case again.