Orbi RBR 750 - PC disconnecting if WPA2 security method is used

Hi

I am having problems with my RBR 750 (plus two satellites) as my PC keeps disconnecting every minute or so if WPA2 security method is used. All other devices work fine. If WPA3 is used instead, the PC connection works fine but some devices cannot connect simply because they do not support WPA3 I think.

As a workaround, I have created a guest wifi with WPA2 security method and connect the devices not supporting WPA3 to it. However, as I then cannot use the guest network for its original purpose, it is obviously not a perfect solution.

Do you please have any ideas how to solve it?

Many thanks

Jiri