I rode down from Le Grand Balloon in the rain. Headset worked fine all the way outputting the directions and what not from my phone. It wasn't torrential rain, just rain. Anyway got to the bottom, found petrol, booked a hotel and rode to it. Sorted myself out for the night and put the Sena on charge ready for next day. Woke up packed everything up, left hotel, loaded next GPX up and no directions came from the headset. Thinking the battery was dead I removed it and connected it to the battery pack charger thing for about an hour but still nothing, LED light just flashed blue while I held the power button down. Half an hour later it came on, made a loud static noise, said something about a config error, made more noise then said off and it never came back on.
Sent it back to Sportbikeshop who sent it to Sena, after 2 weeks and a few emails and despite it being 14 months old I got a refund and ordered a Cardo unit.