Hello, I am using iPod Touch 4th gen only for spotify. Both iOS and spotify is up to date.
After spotify's last update the whole experience becomes unbearable. Skipping one song will work after 5-6 seconds of lag, but if I dare to skip 2-3 songs, the app ui becomes unresponsive and eventually closes itself. I tried to restore to os and setup as a new ipod, nothing changed.
There is only one app installed on my iPod and that is spotify.
Buying a new ipod every 2 years just to listen to music is stupid. I think there is not enough tests on the old ipods on your part.
I hope you will fix this laggish experience.