My ipod wont turn on, it keeps dying even if i leave it in charge the whole night and then after it dies it wont turn on the apple logo keeps flashing on and off and it also doesnt let merestore

My ipod touch 5th gen wont turn on. it keeps dying sometimes it would die even if it was in charge, once it dies it doesnt turn on it keeps flashingthe apple logo and so i put it to restore and while it was restoring it said that there was an error and that it couldnt restore my ipod so i took it out of chrage and put it back in and it showed that my ipod was dead so then after a while it turned on and it showed the connect to itunes sign i connexct it to itunes but itunes doesnt let me restore or update. so i took it out of the usb that was plugged to my laptop and it showed that it was charging but it was dead, i left it in chrage for 3 hours and i dont know what happend but now it completly wont turn on