The right stem force sensor on my AirPods 3rd gen stops working randomly.

Hello Gdenham84,

If one of your AirPods is not working properly, you can try resetting them to see if that corrects the issue.

1. Put your AirPods in their charging case, and close the lid.
2. Wait 30 seconds.
3. Open the lid of your charging case.
4. On your iPhone, iPad, or iPod touch, go to Settings > Bluetooth and tap the More Info button  next to your AirPods. (If you don't see your AirPods in Settings > Bluetooth, just go to the next step.)
5. Tap Forget This Device, and tap again to confirm.
6. With the lid open, press and hold the setup button on the back of the case for about 15 seconds, until the status light flashes amber, then white.*
7. Reconnect your AirPods: With your AirPods in their charging case and the lid open, place your AirPods close to your iPhone, iPad, or iPod touch. Follow the steps on your device's screen.

How to reset your AirPods and AirPods Pro

If the AirPod still isn't working, then you'll want to check into the available service options here: AirPods Replacement, Repair, & Service

Cheers!