@Luijo How did you power the CPE? How did you connect it to modem? Is the port on the cpr working properly?

@AntonV ER7206 only has V1 and V2, the V4 4.0.5 is which device firmware? Can you check it again?

@73blazer Maybe the session on the web browser is off, it caused this issue, check if you have any settings in the web browser and keep the session and the window is on.

@W38122077 Have you tried Site migration? Can it work?

@73blazer I don't have a similar issue on my controller 5.13, did you try different web browsers? Clear the history and cache for testing. Did you login via the cloud website? Have you changed the...

@JasonAS The managed switch supports sFlow, take a look: https://www.tp-link.com/en/business-networking/omada-switch-l3-l2-managed/tl-sx3008f/#overview