It sits on the top of my open stand, so it has all the ventilation it could ever ask for.

I also removed ALL input and output cables from it... the only remaining cable being power. The symptoms came back - display went out and it stopped responding to any input.

A reset of the rear power switch brought it back to life... for a while.

M 861/ARC LS-26/Linn Unidisk 1.1/Levinson 336/Proceed HPA3/Aerial Acoustic loudspeakers (10T's, CC5, SR3's)