Please tell us some basic information before asking for help:
Model Name: ROG 3 phone
Firmware Version: 17.0823.2007.58
Rooted or not:not
Frequency of Occurrence: most of the times when on a call
APP Name & APP Version (If your issue relates to the app): built in phone call
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Not sure why the phone is turning off again and again when I am on call.