I recently bought a FiiO E7 DAC from eBay. Now when I got the DAC it was fine and worked solidly for around a month or two and then the USB port became kind of faulty. When I first plug it into my laptop or phone it works fine mostly, but as soon as the USB cable is knocked even a little bit it disconnects and I have to jiggle the cable around until it displays "LOCK" again. I think the USB port has been damaged. And since I bought the device from eBay I doubt I will be able to get the receipt so I can send it in for warranty.
Thanks for reading guys and any help is appreciated, even if it is essentially just saying I'm screwed :/