I have no idea why you keep talking about IONOS about this. We have no relations with them. They can’t solve problems you have on a website that they don’t host.
Yes, we have. Repeatedly.
It’s disk I/O. It’s reading and writing to and from the storage of the server.
A quick look at your code gives me the impression that you’re using it to do chunked streaming of your music files. If so, that’s likely the cause of your high IO usage and subsequent suspensions.
We provide website hosting, not radio hosting. You’re free to host a supporting website with us for your radio station (with information about the station, live track lists, etc.), but you cannot host the radio streams with us. Please use a more suitable platform for that.