Hi

I've had a 147 Selespeed for three years now and for the past two
summers, I've had a recurring problem. Typically on really hot days,
the dashboard cuts out. All the dash lights go out, the multifunction
display clears and all the needles freeze. 5 to 60 seconds later, the
lights come back on, the self test starts and the needles judder to
zero, before bouncing back to where they should be. The odometer, whose
value I can just make out, freezes during the blackout, but updates
itself correctly after the dash restarts. This doesn't normally happen
when it cold outside, but it just happend last weekend on a cold day,
while I had the heating up full. This has never happend while
stationary, so I've not been able to switch off and one the ignition.

While its out every other car function operates as expected.

Dealer has no idea, and the failure is not common enough/long enough to
demonstrate to them, but I thought I'd heard something similar before.
Any ideas what could be wrong? Bad connection or thermal cut-out maybe?

Thanks