iOS 18 beta 4 losses cellular network connection

After updating my iPhone to iOS 18 beta 4, I noticed that l loss mobile network connectivity after each regular interval. This is very boring me because can't do anything with my cellular.

having same issue with my second line eSim, it just lost. connection soon after phone being restarted, and says SIM Failure. Main sim card also loose connectivity from time to time, but it restores automatically. eSim would not work unless i reboot phone. I'm on public beta 2

How can this not be fixed yet?

iOS 18 beta 4 losses cellular network connection
 
 
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