Does not mean there was no charge for a 30min solder job.
Whatever
Computer/automotive trick:
With the thing unpowered. Dowse it with 91%(+) alcohol and mash that button for a few minutes. Let it completely dry before supplying power. The fact that it works sporadically is probably due to bad internal contacts in the switch itself, you might get lucky with this method. You can also use electrical cleaner aerosols, but I have seen those discolor plastics.
This of course cannot be used in all settings as it will take hours before you are sure it is completely dry.
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