The first airpods was launched in December 2016. Airpods are used as a bluetooth wireless technology. Airpods have many amazing features such as noise cancellation, customizable ear tips. But there are many airpods users are having airpod disconnecting from iphone issue:

Check the battery level

Check the Bluetooth connection

Reset your AirPods

Update your device

Clean your AirPods

source- https://ityug247.com/why-do-my-airpods-keep-disconnecting/