RS700S 6Ghz Bandwidth restricted to 20Mhz

Hello,

I have a Nighthawk RS700S that is only 2-3months out of the 1 year hardware warranty. I recently detected that the WiFi 7 6Ghz band's signal strength was much less than typical, and upon investigation the 6Ghz band is restricted to only 20Mhz bandwidth. It has always had a 320Mhz bandwidth by default. I have confirmed with multiple devices (Samsung Galaxy S25 Ultra, S24 Ultra, and laptop's Intel AX211 WiFi 6E network adapter) that there are no interfering devices nearby (no devices appear on 6Ghz networks around me), and that my RS700S only broadcasts a 20Mhz channel on the 6Ghz WiFi.

I have attempted to re-flash the latest firmware (1.0.7.96), factory reset, and ensured the 6Ghz wifi drop-down is set to the highest Mode: " Up to 11.5 Gbps". I've also disabled Smart Connect, tried different Channels, and regardless at all times the channel width is stuck at 20Mhz, even at the Auto-select Channel 69, and with no broadcasting 6Ghz devices nearby.

I'm now wondering if this is a hardware failure, which is very unfortunate considering the standard warranty period just ended, and $700 is a significant router investment that I believed would last far longer than 1 year and 2-3months.

Is there any support I can reach out to for a goodwill investigation? The support site is asking me to buy a contract,  however I am reluctant to buy one if there is little chance of this being resolved if it is indeed a hardware failure.

I've attached a screenshot of the 6Ghz band graph on it's default settings, with no other networks on any nearby channels.

Thank you in advance for your support. 

- Miguel D.