I once had the same thing. The problem was (don't laugh) that the sun
was shining through the mouse cover. It messed up the photo-cell inside
the mouse. Whenever I covered the mouse or use it in shade it worked
fine.
Solution was:
paint the inside of the mouse cover black.
Ronald Schalk
E-Mail work: Ronald.Schalk@interpay.nl
E-Mail home: ronald02@pi.net
--- How to turn your Pentium-Pro in an XT ?
--- Install Windows 95!