Has anyone experienced their Flex 3401 fluctuating DOWN in speed when locked in? For example, when locked at 4.5-5, the machine will fluctuate down to what feels like 3-3.5. To the point where I have to lock at 5-5.5 or so to keep the speed up. The brushes here replaced less than 5 or so machine hours ago by Flex. Thoughts?
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