I am sorry I can't reproduce the whole changes I made to my box in these last
few days, however this problem has disappeared for me so far.
One of the noticeable changes was the kernel upgrade to 2.6.24-21-generic and a
line in /etc/X11/xorg.conf
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
...
Option "Protocol" "auto"
which was formerly "auto-dev".
I am sure I have never set the protocol to -dev (which I guess uses
developmental code), however I changed now to standard auto.
After one week of 8 hrs per day work on the machine I have not experienced any
scroll loss, nor system freeze (syslog does not report any of the previous
error messages either).
Maybe you should give it a try and check if this works for you as well.
--
[HARDY] touchpad lockup/drag and lost scroll
https://bugs.launchpad.net/bugs/34501
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