I purchased my x4' approx 18 months ago and they stopped working about 1 week ago. Since they were out of warranty I decided to open the vol/power control part to see if I could see anything wrong inside. So much for these headphones being waterproof as the internal part was completely corroded due to water/sweat ingress.I can guarantee anyone who's device has recently stopped working for no apparent reason, this is due to water/sweat contamination. I still think they are up there with the best of headphones(sound quality), but Logitech needs to do a lot better with waterproofing these devices.
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