Spotify songs randomly stop and won't start back up

I’ve been using the app for over a year and all of a sudden my Spotify will have trouble loading tracks and just stop in the middle of a set! It’s done this every performance for the last 2 weeks, it might be my wifi but why is it all of a sudden happening now? And why can’t it pull from Spotify if the songs are available offline?

Also regular iTunes has been crashing for the past couple of weeks I don’t believe this would have to do with wifi.

I deleted the app and was going to try and reinstall but now I have to pay for it again?

Please help, my spin classes are sucking without my djay app!