I have had this problem before and some how I fixed it after hours of fiddling around a couple months ago.
This time absolutely nothing works. Each song will stop playing after one minute. I have installed and reinstalled spotify on both my lap top and ipod touch. For a while it wouldn't even sync my playlists. After 3 hours working on it today I got my playlist to sync back up on my ipod but the problem remains! It stops playing after one minute.
I pay $9.99 a month for this service and I'm getting tired of this same problem. It's been 3 weeks now that it hasn't been working.
Any other ideas on how to fix this once and for all?