@Fae I upgraded without major problems, a remote site with ER707-M2 with fixed ip lost the connection, the internet settings changed from fixed ip to dynamic ip since there is no dhcp server for WAN...

@BobbyBrittle can you show a screenshot of your SSID configuration?

@Magnus33 Could there be a loop in the network? try and disable mesh on the controller to see if that helps. are there several cables connected to the access point that can create a loop?

@jhg6308 I have said before what I think is wrong, but it seems to me that you are very fixated on the controller problem or EAP670 being the problem and are not willing to look at other sources of...

@markie83 it probably comes from the fact that the mobile operator uses cgnat and has blocked the necessary ports for L2TP. I have had problems with this many times so I no longer use L2TP, Wireguard...

@vijay2801 here is a link to the Omada documentation, everything is not so well described but much is self-explanatory. starting on page 277...