I bought a 6th generation iPod Touch back in November 2015. I have had the same problem occur two times now. Back in December 2015, one day it just shut off and wouldn't turn back on. I had charged it fully and hadn't used it much that day. After it shut off, I plugged it in for several hours, but it still wouldn't turn back on. I let it sit there and then the next day, on a whim, I tried to turn it on and instead it showed a red battery icon indicating the battery was extremely low. I plugged it in to charge and then it started working again. Yesterday night, the same thing happened. I first charged it fully and then went to sleep without using it. When I woke up, the iPod was shut off and it wouldn't turn back on. I plugged it in to charge for almost 6 hours or so but it still wouldn't turn on. I chatted with Apple support and she had me hold both the power button and the little circular button at the bottom for several seconds. It then turned on but had a very low battery. She then ran a diagnostic and told me there did not appear to be anything wrong. She then asked me how often I power off the iPod and I told her rarely, probably only 4 times since I have owned it since late November 2015. She told me this was probably the issue and that I should power it off at least once every two days. I think this sucks. I like to leave my device on constantly. The device shouldn't shut off by itself when fully charged and also lose its charge instantaneously like this. What do you think? Thanks.