iPhone just keeps offloading SoundCloud app even though it is used heavilly
I am actually using this 'Offload' feature for a long time and I took care of my apps about whether they are still ready to use...
But..
I have never seen the situation that you've faced. It's interesting for iPhone to execute Offload App command such an app which is in being used constantly.

My advice you to delete the app without offload and backup, directly erase the app, then install again and start from zero to use. I hope it DOES work in time!