Markus Malmqvist writes:

At the end of last year the camera got some water inside it, and was
unusable for many hours. Perhaps water caused some slow damage?

Water might have promoted corrosion that could provide a leak path for
current, or something like that--especially if you turned it on before
it was completely dry, or if the water was not very pure (e.g., salt
water is a good conductor and quite corrosive).

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