Hi abhijeet1212,
Thanks for using Apple Support Communities. If you haven't already, please follow the steps in the Related Article at the top of the page. These steps can help when AirPods are working as expected. If the issue persists, it's possible the behavior is caused by wireless interference. Take a look at the following resource for tips on how to reduce wireless interference:
Resolve Wi-Fi and Bluetooth issues caused by wireless interference
If the AirPods continue to disconnect, restart your iPhone 13 Pro. Restarting can resolve many unexpected behaviors.
Restart your iPhone
Let us know the results. Be sure to include any other troubleshooting steps that you may have tried.
Have a nice day!