Try the website. Maybe another app for YouTube.
The official app has a 2 star rating and on the Mini 1 my wife has sometimes it works fine and sometimes it keeps dropping.
We have never updated it and never will, so it is running 7.x something . Whatever it had when it came out of the box.
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Yes. On my Android phone the YouTube App runs like a champ.on the iPad not so much.
If it wasn't for the design apps I would've bought an android tablet already.