@lasa Have you tried using this method?? https://community.tp-link.com/us/home/kb/detail/490 If at all fails, you may have to proceed in sending it back for warranty claim.

@Happy_x50 Hard reset all of the decos and start from scratch, have you done that? Or maybe try swapping the nodes as the main one to zero out which node is giving you the problems.

Nobody knows. Tp-Link forum admin won't answer it directly and will always try to be neutral and advise to wait for further updates. Deco users are at the mercy of the engineers, they only release as...

The preferred band is under your adapter settings. Google for your notebook model and search how to look for the settings. Or refer to youtube for videos. Plenty of it online.

@HriD Yes, always place the latest version as the main node if possible, unless there is something that there isnt working, then more often than not, should you use a lower tier one as the main. But...

@Whitesnake My subscribed speed is 500Mbps down/ 100Mbps up, not fantastic pings, but can nearly achieve close to max speed. Running on free ProtonVPN, setup with Wireguard