I've heard it's a problem, especially if your freewheel is lubricated with grease, which can get very stiff and cause the pawls to not want to engage. I've never had it happen to me. I'd flush with WD-40 to try to get the grease out if it started happening, then probably some kind of light spray lubricant like DuPont teflon+wax
Teardown is possible, but could be tricky.
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