Does it work if you turn it off, then wait 15 seconds, then turn it on?
Your question specifies on off quickly
When you cycle the power switch quickly sometimes the electronics do not get the chance to discharge, leaving erroneous data in the buffer. If the unit otherwise operates OK, then just make sure you pause between switch operations.
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Manual in Adobe PDF format for download from above web link. Unfortunately, it didn't show the error 7.
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