Wlan to 5 Ghz Support?

There are many reasons possible at the moment:

- MW Servers are not the best this time. In some matches very laggy in other games without lags

- Wlan Performance 2 GHz / 5 GHz

- NAT open?

- Internet speed / performance of your ISP

- and of course many many people are at home because of covid-19 so servers are stressed or temporarily limited

I would recommend that you consult the manual of your wireless router, to have a better understanding of the different settings and how to make a configuration.

If you have WPS enabled on your wireless router, please make sure to disable this option, before you make any configuration changes.

The password, you set for your WLAN, is also known as the passphrase.

If your wireless router operates on 2,4 GHz as well as 5 GHz rf band, then you can create separate SSIDs along with a unique passphrase for each of your SSIDs

To Samuel3201 point and your question about 2.4/5 GHz simultaneous. The xbox 360 will not be connected with 2.4/5 GHz simultaneously. Your router being 2.4/5 GHz simultaneous/dual band just means that it will be able to route traffic on both the 2.4 GHz
and 5 GHz clients at the same time, but not combine them. Think of it as the router having 2 phones and talking to 2 people at the same time as opposed to only have a single phone talking to one person, hanging up and calling another. Also xbox has only released
wireless adapters that are compatible on both 2.4 GHz and 5 GHz using the standards b/g (2.4 GHz) a(5 GHz) on the old wireless adapters and then the new wireless adapters can do those other standards plus n(2.4/5 GHz).

Try restarting your console and see if that sorts it out, if not, please try changing the network frequency on your router settings from 2.4 Ghz to 5 Ghz or 5 Ghz to 2.4 Ghz.

Is your console connected to the 2,4 GHz RF-band? If so, and if your wireless router support dual band (2,4 GHz, 5 GHz), try connect your console to the 5 GHz RF-band instead.

If this is not an option, try connect your console with an Ethernet cable instead, and have us know whether your console is able to stay connected, or not.

You haven't told us what connection type your girlfriend is using.

USB 3.0 is susceptible to cause noise, or interference over 2,4 GHz.