Q: ipad Mini stops when playing an album  over airplay to Apple TV after 1 or 2 tracks - even if the album is downloaded to the ipad device. Why?

Hello Chris_farnhamcommon,

After reviewing your post, it sounds like the connection is interrupted when using AirPlay from and iOS device to the Apple TV. I would recommend that you read this article, it may be able to help the issue.

Get help using AirPlay and AirPlay Mirroring on your iPhone, iPad, or iPod touch - Apple Support

If your playback is interrupted, or you have network lag

You might notice these issues if you have a weak Wi-Fi signal or interference from a different device, like a microwave or baby monitor. Try these steps:

1. Make sure that you're using the recommended settings for your Wi-Fi router.
2. Move or turn off other devices that might cause interference.
3. Try connecting your Apple TV directly to the router using an Ethernet cable instead of Wi-Fi.

Some apps might stop AirPlay when you lock your device or put your device to sleep.

Thanks for using Apple Support Communities.
Have a nice day