I’ve given up attempting to fix it.I turned off wifi and the problem stopped. So it got me thinking that the phone is constantly trying to download something and failing. I found that when I transferred to the new iPhone 14 pro three movies did not download and were constantly trying to download. I canceled the download. So far no more system data problem.
Whatever I do, doesn’t work, and not connecting to Wi-Fi doesn’t work - mine is still growing when only operating through data.
I shouldn’t have to change my usage behaviours, or try to workaround the problem.
It just needs to be fixed - it’s clearly an issue.
(As you can tell, I’m getting a bit pissed off now - I had another enjoyable conversation with Apple support who were next to useless. I must have done 10+ restarts, resets, setting changed etc. It’s ridiculous. The hey tried to say it was normal behaviour again! What buying a 256gb device, and for 170gb to be consumed by system data? Utter, clueless BS)