How has your investigation into the cause of the development link coming up 2 minutes after production link? Given that this only occurs on a SE and not on an iPhone 11 my assumption is that either the cellular/wifi chipset or software has temporary connectivity issues when switching networks that doesn't occur on the iPhone 11 and that it tried to bring up the development link in this period where the connectivity was bad, and that the retry/recovery for when this happens is likely inadequate. Note that the phone shows full bars in reception when this occurs, and that in the same location it cannot be reproduced with an iPhone 11. We would like to know if you are still looking into this. Or if the conclusion is that the iPhone SE is just bad and we should put up with our users not getting Push To Talk calls for minutes after switching networks.

We just submitted our app for review, will let you know how it goes.