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Haven't looked here lately, but thanks for tip on topline seller.
@pastry_bot with the benefit of hindsight, I think I will smear a little silicone grease into the seams of the casing (if they replace or repair the light under warranty. I've sent it back to the retailer, Starbike). I think mine may have let water in just at the top of the lens where the casing has a sort of lip overhanging. The bike was outside on a rainy day hung vertically by the front wheel the day the light went bonkers.
Skülly-
This may be a little late, so apologies. But I had similar performance after I washed my bike upside down and let water get in the bottom.
That is, I did exactly what the instructions specifically warn you not to do.
The light started flickering despite being turned off, but was otherwise unresponsive to the switches and whatnot. Panicked, took it off the bike and put it in a big bag of rice for a couple of days. It was a bit erratic with the USB charge indicator light for the first week or so back on the bike, but it's been fine since.
But if starbike/BUMM (who didn't reply to my email) don't replace or repair it for you, you might still be able to save it?
tyeness
This guy is selling a topline plus? No idea if it'll work, but just in case ;)