Spotify of old 5c iphone stops playing after 8-9 hours of play.

[KokoFit]

I'm looking for a why to play my playlist 24/7.  No matter what I do, my playlist will stop after 8-9 hours of nonstop play.  The phone is plugged into charger with full power, and the internet is confirmed to be on when it stops play.  The playlist is 100 hours long.  I've tried with diffrent playlist with random non random, with repeat and no repeat.  All stop after about 8-9 hours.  

[ToolboxT]

I recommend going to settings app on your iphone and navigate to Display and Brightness and set auto lock to never. 
Then plug your phone in and start playing the audio and leave the app open then do not touch your phone. 

Let me know if this fixes your issue.

[KokoFit]

Thank you for your response.  I did everything you suggested and it did not change.  However, I have noticed that when the service stops, it has exited out of the program, and is back in the app screen.  Is it possable that the program is forced to exit or there is a timeout setting?  

[ToolboxT]

Thats what I thought the problem was. I was hoping following my instructions would work. However, if it doesnt that means that there is no possible solution and that it is something within iOS itself and not something within Spotify's control. Let me know if you need any more help!

[KokoFit]

So you think it's the iOS?  I havent updated it to the latest.  It's a few updates back.  

[ToolboxT]

I think it is in fact the OS. I would recommend updating because its always safter to be on the latest one and you get the newest features. While this may fix your problem I am not 100% sure it will because iOS most likely has something that prevents an app from running for a certain amount of time.