I am facing the same issue as well on my XR and it is frustrating to have to restart the phone all the time. 😒
A23W10
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I’ve tried out the solution suggested by Bug_reporter and so far my phone network has not been lost when using 4G
Steps: Settings > Mobile Data > Network Selection
Disable "Automatic"
Select your mobile network manually
Restart the iPhone
After that, try to toggle airplane mode and check if the mobile network connection still works.