Cyber lamp going off but lamp LED still lit?

I have a Cyber that drops its lamp strike seemingly at random (however the lamp LED doesn't flash, it stays lit).

The fixture will continue to respond to DMX (mirror etc will continue to move) and will sometimes restart with a DMX strike command, sometimes it needs to be powered off for a couple of hours before it restarts.

Any clues?

Thanks,

Scotty.
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