Mouse keeps stopping

I have a Logitech Marble Mouse and have been using it no problem for months
and months, then a couple of months ago it suddenly decided to stop working,
ie. cursor just freezes on the screen. This is intermittent and can happen
when I've brought the computer out of standby (mouse won't work at all) or
can suddenly happen when I'm using it. It is attached to a hub that I have
thoroughly checked and other hardware works fine from the hub and from the
port that the mouse is plugged into. My graphics tablet mouse and pen,
behave in the same way.

The only way to get things working again is to literally hold the on/off
button on the computer, ie. power it down without closing any applications.

I mentioned this annoying mouse inactivity to several work colleagues and
they are experiencing the same sort of thing and like me, they thought they
were the only ones. Oh no - there is a growing population of mice suddenly
going on strike.

There is no pattern, some are working from hubs, some from the computer
direct, all different kinds of mice, and some computers with and some without
the Microsfot updates of recent months, some with and some without SP2
installed.

I downloaded updates as suggested, updated drivers etc., all to no avail.
Please be aware that my problematic mouse is a Logitech and others' are Dell
mice. Therefore no pattern there either.

Has anyone found the answer to this problem yet?