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I thoroughly violated the warranty on the old one...not this one.
... but I believe I've solved it.

WIth the old one, with many lousy design features, the wiring was prone to being yanked...

It was the Luxos U and yes, the one I have now is an IQ2. . The Sinewave never gave me a problem. ( it's a Revolution).

I haven't even tried to charge anything through that port ... tho'...

I have a Busch Muller dynamo hub on my bike and ... when it was new it was brilliant.
Two years ago I sprang for the light that had the extra USB port ... well, the first light rain shower that...