When I first got my Escape, my phone wouldn't work worth a hoot. Later I saw that my daughter had put an emoji smiley face after her name in the contacts list. As soon as I removed the emoji, no problems with the phone.
Some of the music from iTunes or whatever downloads videos with the music. I have found that the video files mixed in with the music files plays havoc as well.
My point being that any type of file that doesn't play well with Sync will cause hiccups and maybe something has found its way on your iPod.
2013 Ginger Ale Titanium 2.0 AWD, Factory Tow Package, Pano Roof and Roof Rack, Kuga LED Rear Tail Lights, Factory Added NAV, factory Added Rear Camera, Rear Spoiler, Build Date - Sept. 2012