Lower LQ on ELRS 4.0

[high robin]

I recently updated my ELRS from version 3.6.0 to version 4.0.0 on my Air75, and I noticed that when flying indoors in my room (so at most 5m distance from my RC) the LQ is consistently lower compared to before. Before the update, the LQ was consistently around 98-100 (but mostly at 100), but now it is often between 95-100 (and rarely at 100) and regularly dips down to the low 90s. My RSSI is still between 38-60, and the RSNR is between 9-12 (but mostly 11-12). I use 250Hz at 2.4GHz with 25mW and LBT.
I am also building a second quad right now (with the same ELRS version and settings) and the LQ values on that one behave similarly to those on my Air75.

Is this a common issue and should I look into this problem, or am I being overly cautious?

(PS: I also updated Betaflight from 4.5.x to 2025.12.2, so I dunno if this could have also cause this problem)

[rotund shuttle]

✨AI-Generated response✨

It is normal to see slight variations in link metrics after firmware updates, and indoor environments often involve multipath interference that can affect link quality (LQ). Since your RSSI and RSNR values remain healthy, you are likely not experiencing a range issue. However, you should ensure your Flight Controller setup matches the requirements for your version, and verify that you have applied the correct RC Link Preset in Betaflight.

If you are concerned about your hardware, you can perform a bench test to check for signal deviations or antenna issues.

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please follow up in #help-and-support or #general-quad-help

-# {'cause': 'thread creation'}

[indigo vigil]

If you are using LBT, the LQ will always be lower depending on the local interference. If you are flying whoops, consider flashing FCC firmware and running at 10mW, which does not require LBT.

[high robin]

Thanks for you answer ^^