I have a Lenovo Legion 7 Laptop with the following WiFi card - Killer(R) Wi-Fi 6 AX1650x 160MHz Wireless Network Adapter (200NGW)

I recently bought an Archer AX90 AX6600 router and I've been trying the set it up but I have problems.

I am trying to set-up the 3rd band to 160Mhz channel width. As soon as I change the channel width to 160Mhz my laptop stop seeing 5GHz-2.

I was lucky ONCE and for reasons unknown to me while changing settings on 5GHz-2 I managed to see and connect to it and got the advertised 2.4Gbps link speed.

However as soon as I rebooted the router I stopped seeing 5GHz-2 again and no matter what I try it won't show up again if I set the channel width to 160Mhz.

I've searched high and low about what might be the issue but I have found nothing.

Notes:

1. It's not a compatibility issue - if I managed to see and connect to 5GHz-2 once and see 2.4Gbps in Control Panel

2. When the channel width is 160Mhz none of my devices see 5GHz-2. Only the laptop has the AX wifi card but all should see 5GHz-2 but won't be able to take full advanced of the speeds

3. I have the latest drivers installed but this is not relevant since it clearly isn't a compatibility issue.

Any help will be greatly appreciated.

I think the issue is with the router itself or its firmware. I hope I'm wrong because I wouldn't want to send this router back