Optical Mouse USB connectivity problem

Using the optical mouse (M/N: MO56UOA, DP/N: OCJ339) at my Precision workstation S390 for about 20 months was without any problems. Suddenly the mouse USB connection is lost fro a few milliseconds or longer, alerting with the USB disconnect/connect sound. I found something here in the forum disabling the Power Saving for the mouse would solve the problem. While I do not hear the USB disconnect/connect sound anymore, the mouse still reacts erradically. It is often impossible to mark a simple text line and doign graphics is close to impossible as a selection is almost all the time incorrect.

So, I took another mouse (M/N: M-UVDEL1) from by PowerEdge SC1430 and it worked for a few days/weeks, but I now have the identical problem.

Just now I connected the third mouse from a Dimension 8300 (M/N: M-UVDEL1) and will see how long that works...

I tried several different USB ports including monitor etc., but all with the same results.

I checked if there is any driver update available, but it doesn't seem so.

I have a 3 year warranty ... but just replacing the mouse would not help in the long run.

O/S: Windows XP Professional x64 Edition, Version 2003, SP2

H/W: Dell Precision PWS390, Intel Dual CPU 6300, 1.86GHz, 6GB RAM

The malfunctioning mice work fine on my Dimension 8300 and PE SC1430.

Any hints appreciated!