They don't... I have returned 2 of my ax2 and one was "repaired" with no information on what was "repaired"
I put back my trusty old cAP ac but im looking into WiFi 6 alternatives (probably Ubiquiti) as i can't buy another ax3 because they are out of stock for who knows how long...
If you can, buy ax3, i have one as my main router and it works so much better then ax2, at least for me.
I need a small one (I have a fixed place for the router), without external antennas, like hap ax2. Ax3 has large dimensions and external antennas.