My display sometimes turns off in the middle of using any app.

[akash_tempting]

Please tell us some basic information before asking for help:
Model Name: ROG Phone 3
.Firmware Version:RKQ1.200710.002.WW_Phone-18.0410.2106.138
Rooted or not:not rooted
Frequency of Occurrence:Once or twice at max daily
APP Name & APP Version (If your issue relates to the app):
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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[AV777]

You may be accidently double tapping the notification bar.

[ARP_ASUS]

Hi akash.tempting,
Can you share a video for the same.
Also, as mentioned by AV777 have a check if the double tap to sleep in on.