SRAM Transmission issues 

Same problem on the same bike. I re-torqued everything and it worked. Axle was slightly under torqued.

Different drivetrain, but I had same exact issue and it was the chain. Wasn’t worn either, but swapping it fixed it.

Have you tried the derailleur micro adjust and check if it's a frozen link?

Design flaw on the 3rd cog?

Worn chain was the fault when I had that

I had a similar issue with my GX AXS transmission, it happened, since then, when I released the screw fixing the rear derailleur to the frame. Anyway AXS was new thing to me, hence I did not realize there is an exact process how to install it correctly and not just tighten it back. It produced some crazy things and sounds on 3rd cog, but when I followed the installation video from SRAM, ( called - SRAM Eagle AXS Transmission System Installation ) everything works well (for now). I will keep you posted if it appears again. I hope this helps!

Gut the same issue. Brand new system.

Same thing for me in the 2nd highest gear. I am going to the shop so they can look at it. I have a few hundred miles on my 24 Supercaliber 9.9 XO, so not happy about this.

same problem here. 14 miles new

You have frame alignment issues. Send back the frame under warranty

Same issue with lauf seigla bike. I fixed the problèm with micro adjust

Seems like a worn chain

Same setup, exact same issue (3rd to cog). Brand new setup...

I’ll stick with OG AXS