iTunes downloads fail/restart once they reach 'processing'

I'm trying to download some TV episodes from iTunes to my iPad but each time the files reach the 'processing' stage the download restarts.

I have 10GB+ of free space on my iPad and I'm trying to download one <2GB episode at a time. I've tried closing all other apps, clearing the iTunes cache (tapping one of the bottom icons 10 times), restarting the iPad, hard-restarting the iPad (holding home/sleep) but nothing seems to be working. I can download the same episodes to my iPhone without issue so it seems to be a problem with my iPad and not iTunes/the episodes.

Anybody experienced this before?

Edit: 4th gen iPad running 9.2.1