Wi-Fi 6 5GHz speed dropped to kbps after pc booting up

The drop happens after starting the PC, but “kbps” could describe either a slow wireless connection or low application traffic. Separate those measurements before changing router settings.

While it is slow, run netsh wlan show interfaces and note the network, band/channel, signal and receive/transmit rates. Compare those with a speed test, then repeat after reconnecting Wi-Fi. Test another device on the same 5 GHz network at the same location. That helps distinguish a PC-specific problem from the access point or internet connection.

Generate Microsoft's wireless report from an administrator Command Prompt with netsh wlan show wlanreport. Review connection failures and driver information around boot time. Compare that driver version with your PC or adapter manufacturer's supported release.

Please share the adapter model, driver version, whether reconnecting restores speed and both measurements. Redact network identifiers from reports. Reserve network reset for later; Microsoft lists it as a last step.