The front light on my new Spa tourer has an annoying but not fatal problem: it dims regularly but very briefly, about every 18-20 seconds. It's a Busch & Muller Lumotec IQ-X with a sensor that automatically puts it into daytime mode; it looks like the flicker is the light briefly dropping into daytime mode and back again. Dynamo is an SP PV-8 and there's also a Toplight Line Plus rear light and a USB-Werk attached.
I asked Busch & Muller if the light is faulty and they suggested trying a different dynamo first. Anyone got any suggestions before I try rooting out a different front wheel and swapping everything around?
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Belatedly: yes, unplugging the USB-Werk appears to have done it. Not a problem for me as I only use the USB-Werk in daylight but I've mentioned it to B&M as a possible fault. I wonder if I should let Spa know, too...