4g network constantly disconnects after Android 11 upgrade

Please tell us some basic information before asking for help:

  1. Model Name:ZS630KL-2A016WW
  2. Firmware Version: android 11
  3. Rooted or not: No
  4. Frequency of Occurrence: Constantly in a loop
  5. APP Name & APP Version (If your issue relates to the app):

After Android 11 upgrade my the network constantly disconnects and reconnects in a loop when 4g is selected. This doesn't happen when I remove 4g and only select 2g,3g

Tried factory reset and, still no luck. Have attached recorded behaviour. Pls see the mobile network on top right corner.


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