With mine I do have to press harder when the batteries are low as there is a tiny tiny hairline crack in the circuit board going over one of the metal lines.. When the batteries are new, somehow the electrical signal jumps over the tiny tiny tiny gap, but when they start to get low, I have to press the button down hard so the circuit board bends and the 2 signals sides touch and the signal can go through..
But that's kind of special circumstances.
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