It could be a lot of things; such as, faulty wire connection, cold solder joint, HV voltage arcing, corroded battery terminals. intermittent short in the switches. If it stop work, try gently shaking it several times, push the on/off button several times. make sure the battery makes a good connection in the battery compartment. Wrap it up and put it in your freezer for a few hours. There are electronic components that might get hot/warm and by cooling them down they will start working again. GB...stewbison
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