Calls disconnect when VOLTE is enabled

edited September 30 in ROG Phone
Model: ZS600KL
RAM: 8G
Firmware/APP Version: 15.1630.1903.89
Frequency of Occurrence: Often
Rooted: No
APP Name:

My ROG phone was fine 2 updates ago but on latest firmware when VOLTE is turned on it disconnects itself either within the 1st min or 5th min. Receiving call produces the same outcome. When VOLTE is disabled everything works fine.. I thought it was my set so I changed to a new set produces the same problem which leads to me believing that it's software related. Changed to a different sim card also didn't help. Care to help?

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