iPod Nano 6th gen volume issues

The volume on my Nano seems to go up and down on it's own to random songs. I'll have it a good volume, then after about a couple of songs or so, the volume would either drop down considerably, or go up considerably. When this happens I have to adjust the volume manually.

I thought it was because I had didn't have Volume Adjust set to ON in the Nano. Turned it on, but didn't fix. Then I was told turn on Volume Adjust in iTunes for the synced music folder. That didn't help either. Then I was told they have to be set to None/Off. So I turned off Volume Adjust in iTunes and the Nano. Still fluctuating. One note, when the volume drops or goes up and I have to adjust manually, I can't just hit the volume up or down buttons to go up or down a bar. Hitting it few times doesn't actually work. I have to HOLD the either button down for it to adjust the volume. Doing this makes the volume jump several bars up or down. At this point, I can now hit the volume buttons in increments and will work.

No "wet", "moisture", or "humidity" issues. Nano is kept dry at all times. Other than this, the Nano works great. I've also restarted, restored, and updated to latest firmware, with no fix to this issue. Any input would be greatly appreciated.