Is there a way to disable SoN (Self-organising Network) feature on the Deck M9 plus? And if so, how?

I have two Chromecast with Google TV dongles which as off sudden decide to actually turn it's wireless setting from on to off after a few hours of inactivity. Yeah, crazy. Right?  This problem has been reported by many users. Turning off SoN on the router seems to be the accepted workaround.

Thanks!