So, the last time my M5 stopped working, it started up again, a couple of days later. This time, it's really dead. So, after about 6 months of regular use, it refuses to turn on anymore. I emailed Shanling with a copy of my receipt and still haven't heard back from them yet. At this point, I doubt I'll hear back. I LOVE this device but at this point I can't see myself replacing it with another. No warranty service, no sale.