I have also seen the warning to handle the magnets carefully. I do know that the ones in my bike have never been dropped themselves, though the bike itself has unfortunately been in a bit of a tumble, only resulting in a broken mirror and a bent left-hand clip-on, easy fixes.
That tumble was a good 3-5 thousand kilometres if not more from the problem arising, but do you think that could be a cause to the problem?
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