xcode app store connect "The Network connection was lost"
Installation info:
I'm using Xcode 13.2.1 (13C100) on my brand new Mac mini (M1, 2020). 16GB Ram, macOS Monterey 12.0.1
Literally new out of the box and fully updated.
I have a hard wired connection to a 1Gb symmetric leased line. My speedtest is 16ms ping, 940Mb/s download / upload, so I know my network is as good as it can ever be.
Yet, every time I try and submit the store from XCODE, I get the dreaded "The network connection was lost"
Archive -> Distribute App -> App Store Connect -> Upload
It does all the checks
I tick all the distribution options
I select "Automatically manage signing"
Then it communicates with Apple. It gets to the signing process, and it signs some of the items / frame works etc. This is where the problem is. It gets so far, and stops. The file it stops in is totally random each time. Sometimes it gets 10%, sometimes 90%.
On a very rare occasion, it gets all the way through and allows me to upload.
I have tried Archive -> Distribute App -> App Store Connect -> Export
But the same thing happens. It bombs out on the signing process, before it produces the IPA.
I have tried every resolution I can think of. Restart XCODE, Mac, Clean Build Folder, signet and back in via preferences to reset the account / certificates etc.
No Change.
Any ideas what could be wrong?
Mac mini, macOS 10.15