Ultrasonic cleaner stopped working

hi Forum
anybody else having issues with ultrasonic cleaner?
this is the second one i have had … as the first one fell apart … it powers up but has completely stopped vibrating… just sits there and does nothing ( a bit like me…!) … wierdly i got use to tapping the lid to start the vibration previously (which always seemed odd) however now it does nothing anybody got any idea why please?
thx

H @parakartracer,

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