4g signal dropping to network not detected when making/receiving calls

Please tell us some basic information before asking for help:

Model Name:rog 3 ZS661KS

Asus_I003D

  1. Firmware Version: 17.0823.2007.25
  2. Rooted or not: not
  3. Frequency of Occurrence: Everytime I make a call
  4. APP Name & APP Version (If your issue relates to the app):

When I try to make call it suddenly drops my signal from 4g to 3g , thats pretty normal I as shown from my 1st and 2nd picture

But my call will not continue but will automatically end then it will show that I have no network detected as shown on the 3rd picture.

Same goes when somebody is trying to call me , my signal will drop to 3g then no network detected.

I tried factory reset, reset network settings, disabling Google carrier services, hard reset, restarting device, shutdown device none of them worked


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