When you are connect your Airpods to your iPhone and when during calls or listening to music on your iPad or on your iPhone then you can forget and reconnect airpods and turn on Bluetooth, turn off automatic ear detection to fix air pods keeps disconnecting during calls from iPhone and iPad. If your airpds keeps disconcerting after update and you can see your airpod disconnecting glitching and you can reset your iPhone as well.
Forget and Reconnect Airpods
Turn off Automatic ear Detection
Turn off Bluetooth and turn on Again
This happens due to sensor inside the Airpods which was unable to detect that your AirPods are on your ear or in the case this happens a glitch / software glitch and by updating to latest version or reset your iphone.
To fix this issue you need to forget and repair Airpods, turn off and turn on Bluetooth, turn off automatic ear detecting and you will not get Airpods keeps disconnecting during calls.