Yes, quality control issue must be it! It can happen with any company. U fortunately only few of us are in China , to claim any warranty. I don't understand how practical is the warranty all these Chinese manufacturers give if it is to ship back to china for an inspection. Luckily mine wa bought from china by a friend and he had checked it before he returned. It never showed any issues other than crashes with rockbox. But when I rolled back to only stick it was super stable. And battery was back to normal. Anyway, listening to the experiences others have with Chinese players I am a bit reluctant to get another Chinese player shipped from china directly. X10 is on the list, but I am waiting for some of my Chinese friends go home, or amazon prime to list it, though may be a little more expensive. Hope they can provide a solution if it breaks down