> Try to remake all the solder joints, I can't think of anything else.

Whole thing currently resides on breadboard. No soldering involved. I'm
100% sure that the problem is NOT in 'bad contact'.
I think that Russell pointed into right direction - hand capacitance
comes into play.

I have quite long (1 meter) power (5 volts) wires to breadboard. Maybe
this has something to do with it?

Aadu

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