What is the difference between a reset and delete
When you reset you basically restarting the hardware and the device reloads the software. 

When you delete you remove all the data from the device.

Though to solve your problem I would suggest you try the following:

Use iTunes to Restore your iPod to factory default. Once complete reload your content.

when you restore you erase the device completely and it reinstalls a new copy of the software to the device.

Regards

Kyle