I've just come back from 2 weeks in Indonesia where it's been hot with 95% humidity and my 5s has died. I can't get to an Apple store till end of the week, but I took it to a mobile phone repair shop to check it out and they couldn't really do much with it, other than say the water damage sensor had gone off indicating water damage. So I'm guessing Apple are going to tell me the same thing. However it has not been near any water, other than a bit of sweat and humid weather. Has anyone else experienced this? Anything else I can do?