Yes, it's only once I've uploaded to testflight. No issues on debug. Not sure what exporting the dev build and installing on device will accomplish? I'll try to do it, if I can figure it out. The crash log from testflight only gives an 'init' error (i guess), seemingly where the first zstack in contentview starts. I tried turning off bit code encoding, but it also did not remove the crashes. The random nature of the crashes, in that it occurs once every 5 - 10 attempts is really strange.

Is there some step-by-step instructions on how to do this? Because fiddling with XCode I can't seem to find out how, and google hasn't helped (maybe I'm not hitting the right keywords?). Random frustration: why would deployment build ever be different from debug build? It just seems silly and needlessly convoluted?

Thanks for the explanation. I followed your instructions, using Apple Configurator. The crash still occurred. I then googled a bit more and decided to try disabling Swift Code optimization for release, in the build settings. It works perfectly now in testflight. Perhaps I do not need optimized code for my app, it seems to work well enough as is. But now when I got to appstoreconnect, it says: An error has occurred. Try again later. I can't find my app anymore?

I would like to fix this bug. But how can I do so without the ability to debug it? Shipping it now with optimization turned off is a quick way to fix the bug while I try to debug it. Because, I'm not sure exactly how I can debug it? The crash reports are very ambiguous. I don't know if it's possible to simply debug on xcode with the release compiler? I don't even know what the bug is? Or how to find it? All I know is that it has something to do with the optimized compiler. And a single attempt at a debug cycle can easily take 10 minutes instead of 10 seconds.

Same issue. Any hope of resolution?