If it's not the self-timer and not the battery, which in my experience would not cause that symptom... then your guess of the need for a servicing seems entirely correct.
But just to cover one more potential possibility, is it possible that you released the shutter and after winding and it was in A mode doing a long automatic time exposure due to low light level?
And, what did you mean by "Got a Nikon F3. Got it to work..."? That implies that, perhaps, there was an issue beyond new battery and turning it on
something in the depths of my sub-conscious is saying something about RC circuit, time constants, etc...
can't quite make it out.
Leaky capacitor(s) ?
resistors in parallel with accumulated (assumed semi-conductive) crud on a circuit board?
current limiting corrosion in wires, solder joints or connectors?
Maybe the shutter release switch is or was stuck in a position where it's nearly closed and intermittently closes, firing the shutter. How does the meter display behave?
.Happening consistently last night - cannot reproduce today. .
Often putting fresh batteries into a long dormant device will bring it back to life.
To the OP - is your F3 working correctly now? You had mentioned you could no longer recreate the issue.
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