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RT-AX55 Router 5GHz Random Internet Disconnection

Star I
Battery or AC: -
Model: RT-AX55
Frequency of occurrence: Every 15 to 30 minutes
Reset OS: Done thrice
Screenshot or video:
Detailed description:
The WiFi connection randomly gets disconnected occasionally. Please take a look at this matter. (WiFi is connected, the internet is getting disconnected)
My Router: ASUS RT-AX55 WiFi 6
With Smart Connect (2.4GHz/5GHz bonded together with the same SSID)
To reproduce this issue, you'll have to connect to the SSID and look at the VoWiFi logo at the status bar (if not available, just run Speed test). Now, lock the phone and wait around 10-20 minutes. VoWiFi logo missing (Speed test will say the internet is not connected).
I did my investigations again by updating my router's firmware (, and switched to separate SSID [2.4GHz & 5GHz], and disabled IPV6.
5GHz is the culprit over here. All my devices using 5GHz bands having this issue (connection lost within 20-40 minutes of usage). Simple reconnection will fix this but it is too annoying.
Kindly fix this issue ASAP. Thank you!
Screenshots below:
Router Client list shows Poco X3 NFC is not even connected
My Poco X3 NFC shows connected to the router but the internet is not accessible (VoWiFi logo missing)