@JackShepard sounds like a plan :-) one of my kids has two of these with 5.1.0 firmware and omada controller 5.9 on linux and ER605v1 whit 1.3.0, never had a problem. but if you test it at home do...

@JackShepard OK then you have all the latest versions, seems like this is a tp-link support issue, I can't quite see what your problem is then, have you tried deleting the device and re-adopting?

@JackShepard Upgrade your router to 1.3.0. 1.0.3 is problably full of bugs what version is your controller?

@DarLynn have switches access to radius server ip port? is switch on same vlan as the controller if not you have to do some firewaling..

@ManuN7 upgraded 2 ER605 to 2.1.4, no problems, but I had no problem with 2.2.0 either, both upgraded ones have a remote controller so it is not a local controller controller version 5.9 linux and...

@Karyuu thanks for the info, I have one in the lab now, everything seems to be working fine.