Hi Slothem
We know just how important it is to be able to get your headset working seamlessly with your PC and so we would love to advise on the issue you're experiencing with Airlink at the moment.
As Airlink had previously been working for you and has only stopped working after you advised you had to reinstall the Meta Quest link app there is a chance that it is not properly recognizing the pairing of your Quest Headset and your PC.
In order to combat this we would advise navigating to the settings menu in your headset and toggling off Air Link. Once this is done we would then advise restarting your headset and PC and re-pairing your headset to your PC again. Once your Headset is paired to your PC once more you would then need to toggle Air Link back on in your settings and the app should then recognize your headset as a viable Air Link connection.
If you find that after following these steps that your issue persists we would then urge you to get directly in touch with us by selecting our name to get to our profile page, or by clicking just here. You'd then just need to click "Send a Message" to privately message us so we can gather a few more details around your issue in order to best diagnose and troubleshoot it!