Flippers On Bally Viking Quit After Game Warms Up???

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Hi Guys,

Both flippers on my Viking are quitting after about a game or two. It's
DEFINITELY something common to both flippers as they both stop working
and at the same time.

Appears to be heat related, as when I remove the backglass and open up
the backbox/head, they start working again very shortly. I'm guessing
after letting the heat out.

Also, noticed a sensor or perhaps a relay clicking once, upon cooling
down. Can't pinpoint where the click is coming from. But again, it
happens after heating up and then when cooled down, you hear the click
and the flippers start working again.

Anyone experience this with any of their late '70s, early '80s Ballys?
Wondering what components I should be looking at?

Thanks so much for any help!

Tim