@3ESV @Luka_P Is the DoS Protection level set on High or Middle? What if you change it to Low, will it still block the internet access on that special device? To analyze this issue and try to fix it,...

@ksuuk Both AX20 and C80 support MU-MIMO, while marketing materials on the website is different among models.

@Mcmclau Please check if there is any setting on the AX20 that will turn off the network, such as Wireless Schedule, when you are connected to the network. Meanwhile, please ensure you are running...

@Jajo Thanks for the screenshots. Please try to uninstall the printer controller from this macOS, then reinstall it from beginning, check if there will be a difference. We will report the issue to...

@TUllman Have you installed the printer driver on the BigSur 11.2.3 already? Can you print if you connect the printer to the BigSur directly (If it can connect directly)?

@Luka_P @3ESV Was there any special activity that you can think of on this blocked device, such as VPN connection?