@Lanze Hi 1. after you configure the CPE have you deleted the static IP on your computer? Change it to get IP automatically. 2. Is the wifi name of your CPE the same as the router's ? Try to use...

@blj-74 You can try to fix the 5G channel in EAP's interface or controller's interface.

@AbdulAdil Hi，Have you contacted your ISP to check it out? Not sure if there is a problem with the ISP's server ？

@andy1102 Hi Theoretically, in this case, you can configure ACLs on the switch to block communication between VLAN's. Have you checked the ACL settings on your switch?

@KBKKeef Hi，I'm not sure if this FAQ can help you to fix the issue. https://www.tp-link.com/us/support/faq/3087/

@NewOmadaUser In theory, there is no problem with such use.