Bought my Fiio X5 and it worked great for a few months, then one day, it got very hot ! so I sent it back for a warranty replacement, and it worked great until for just over a year, and now the replacement has done the same thing, will not power up, plugging in the charge cable, the charge light stays green, and the unit gets hot, so since it is out of warranty, I popped the back off, and checked out the battery, it isn't the battery that gets hot, but the circuits under the battery ! I won't be buying another Fiio player  I used it 5 days a week at...