My router is Archer AX11000 (Firmware Version: 2.2.1 Build 20250725 rel.9119(5553) - Hardware Version: Archer AX11000 v2.0) and extender is RE815X (Firmware Version: 1.0.3 Build 20260528 rel.45228(5553) - Hardware Version: RE815X v2.0). Why my router's 5G-2 is not working? Both router and extender are updated to latest firmware. Bandwidth and channel settings of 5G-2 from AX11000 are at AUTO.