Hello aaronnn415,
Does the problem happen with all calls? If not, do you notice any similarities between when the issue occurs? Does it only happen with specific people or networks? Are you in a specific location? Are you using Wi-Fi Calling when this occurs?
If you do not use the AirPods, does the problem still exist? If it does, you may want to verify your iPhone microphone and audio settings for FaceTime. Here are some links to help:
If it only happens when you use the AirPods, you may want to verify those settings as well:
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These pages offer settings for Active Noise Cancellation, Transparency mode, etc...
We hope this information helps you out!
Cheers!