Does your Ipod screen go black after a minute or two? It may be a simple setting such as crossfade, or a sleep setting, anything really so doublecheck the settings first and foremost.
After that, try cleaning the headphone jack hole, and the headphone jack itself. For this you can use a needle for the port, and isopropyl alcohol for the jack itself.
Next, if you can backup your device before so I would suggest that, Press and hold the Sleep/Wake button and Volume Down button simultaneously for at least eight seconds or until the Apple logo appears. You may need to repeat this step. This will reset your device to factory settings.
If the above instruction did not work try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep. Try resetting the iPod while it is connected to power.