I've owned an e17 since April, 2012.
It's been about 6 months, up to this point it was working fine; now I've got issue with the sound cutting in the left and right channels.
I'm suspecting it is the headphone jack. And it appears the LED screen has burn in.
Any suggestions as to what to do?
Not much you can do about the burn-in. It's gotta still be in warranty right? You might be able to send it to Fiio for a replacement.