Audirvana stopped finding my KEF LS50 Wireless

I´ve been using Audirvana for the last 2 years with my KEF LS50 Wireless in WI-fi mode and I worked really well.
Bought a new router (5.2Ghz) and after connecting the speakers to the new router (wi-fi fixed white light) the KEF Control can’t find the speakers and also Audirvana can’t find them.
Strange is the fact that Spotify app finds them… so what is wrong?
Any help?
Many thanks!!

For anyone with this problem, reset the router and connect the speakers to the router with ethernet cable.
Audirvana will find the speakers and also KEf´s Control App. Unplug the ethernet cable and there you go, wi-fi network connection solved.