Cruise control mystery....

[Rui]

97 A6 QWgn, 38K

Hello all, I have a little mystery with my cruise control that I would
need some
help with.

When I first bought the car (used) the CC worked but if I tried to
increase the
speed by moving the little sliding switch the thing turned itself off.
So I could
use the CC but not increase the speed with it. Only decrease speed. It
would
however click fine and set any speed I wanted.

A few weeks back the CC started working intermittently. It would stop
clicking
and eventually went out completely.

After seeing a reference in an email somewhere on an AUDI site I
restarted the
engine while in movement coming down a hill. And sure enough the Cruise
control is back to work! Still with the issue of turning itself off when

I try to
increase the speed but it clicks again and seems to stay on.

This is driving me nuts. Any ideas on what is causing this engine
restart to fix the CC?
And why does it turn itself off when I try to increase the speed? Anyone

seen this
before?

Thanks!
Rui
rg117 at umail.umd.edu