X121e touch pad buttons stop working after a while

Hello everyone,
I have a lenovo thinkpad x121e.
The buttons above the touchpad (for right and left clicking) and also the trackpoint stop working after a while (about 45 min). Although the touchpad itself works without problems.
If I reboot the operating system (Windows 7, 64-bit version) everything works fine for a while and then the buttons and trackpoint won't respond again.
It is always the same routine. Rebooting windows, everything alright, stop working, ...
I am using the newest driver version and de- & reinstalling of UltraNav haven't solved the problem.
Has anyone an idea what causes my problems with the touch pad buttons and how to solve it? (I guess it's not a hardware problem.)
Many thanks in advance.

Hi again, li-lup
I would recommend trying to use the standard Synaptics driver found here. Synaptics is the company that develops the UltraNav software, so there should be no loss of compatibility/features. I have witnessed several cases where this driver has helped others with mouse issues, so it may help yours as well.
The first thing you will need to do is to remove the UltraNav driver from the system. To do this, open the Start menu and type Device Manager into the Search box, and then press Enter. Once here, double click on Mouse and other pointing devices, and then right-click on the UltraNav device. Naviage to the Driver tab and select Uninstall... from the bottom of the window. Follow the prompts to uninstall and then restart when prompted by Windows. Windows should install a generic driver that will allow you to use the TouchPad when downloading the Synaptics driver.
Hope it helps,
Adam
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