iPod touch turned off randomly and won't turn back on?

I have had my 6th gen Ipod Touch for a little less than a year. it's always worked well and I have had no issues with it until now. I didn't drop it in water, or drop it at all,when the screen suddenly went black while I was using it. the battery was low, but I had not received a 20% warning like I usually do. when I tried to turn it back on it did not respond. I plugged it in, and instead of showing a charging symbol like it typically would when recharging after going completely dead, it remained black. I know the outlet is working, and the charger was working earlier today. why won't it turn on or charge?