To Preface this issue, I had the same problems on my Note2

Fast Foarward to now, I have a note 4, totally new hardware and still having the same issue...

So I have a Samsung Galaxy note 4 with android 5.1.1

I have the mobile spotify App, Version: 4.2.0.739

I drive transport for a brewery and so my job consists of constantly Driving around my province on a daily basis. 

From a fresh start the app will be connected to the spotify servers and i can stream music no problem, until not long after (5 to ten minutes) I could be in the middle of a song and it'll will suddenly stop playing or it goes to the next song in the playlist and the song doesn't play. If I try and navigate the menues (charts, discover etc.) it just says im Offline. Full LTE/4G connection on my phone (tested internet connection with speedof.me to check download speeds and it works with no issues) anything requiring data via mobile network connection works without issue, except for spotify. I've cleard the cache and deleted the data multiple times and reinstalled the app cleanly. I've literally switched phones and the problem persists. Other info to help you guys out, yes my phone is running on IPV4, i've checked that setting and read that IPV6 was not supported at the time I read one particular help thread... Seems like while driving and jumping from one service tower to another might be an issue for the app.. just a theory.. I think this goes beyond clearing cache and clean installs, any different insight to this would be awesome

Thanks

Matt