On/Off switch not working

I have this great set of earphones since 2016, however in the past one year, the On/Off switch isn’t working - I can turn it on, but it cannot be switched off. The green light stays on and the battery will just drain by itself. So each time I need to use it, I’ll have to charge it and let it die by itself after it’s run out of juice.

Can anyone advise what to do?

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Just a thought. Maybe try turning the unit off when it's connected to the charger?

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Just tried it, still the same.

Thanks for your suggestion anyway, Prop Man :)

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