[HUG] experience with 553 ELX jams?

Just did a shoot with a 553 ELX for the first time.
Did great until it 'jammed' - push the button. Nada.
Battery- check.
Could take lens off - check. Still nothing.
Fuse - check.

Then it started working again for no reason. Been fine for the last day too.

Anyone with more experience know what could be going on?
Anything I should check.
Previous owner claimed 'it was just CLA'd by Hasselblad'

Eric

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