Checkout this page which talks about how to clean the ProVari.
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Sometimes juice can get into the unit and this can cause strange behavior.
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Troubleshooting Tips
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Try doing the Isopropyl flush using some 99% Isopropyl. If you cannot find 99% then it's ok to use 92%. Pour in about a full shot glass amount and swish it around. Then let it dry completely before inserting the battery again.
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If this doesn't help we can arrange to have a look at it and see what's going on.
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