I've only started noticing this in past couple of months, but my Luxos U never goes completely dark, not even when I turn it off. Has anyone else seen this? It's not the stand-light function because it's much dimmer than the stand light. And it lasts forever. The longest my bike ever sits without moving is two days, but even then there's the dim glow from the headlight. It seems to be functioning as normal when I actually turn it on, so I'm not too worried, yet, but it's a little weird, and I hope it's not a precursor to problems down the road.