Pulse M Rear Speakers + Powernode Connection dropouts

Hi, 

I recently bought two Pulse M's to use as rear speakers with my Bluesound Powernode (n331) in a Home theatre group.

Both Speakers keep losing connection and disappear from the Bleusound App, every now and then they appear back and drop out again. Sometimes both of them, sometimes one keeps connection and the other drops off.

I have connected my Powernode via Ethernet cable directly to my router, the two Pulse M's are connected via Wifi. (it is not possible for me to connect them via ethernet)

The two rear speakers are about 2 meters distance from each other and the rears are about 2,5 meters distance from the powernode, all in a triangle.

i even upgraded my wifi setup at home to try to make it work, all my devices in my house work fine without any problems and my connection is really good. it is not a very big room, and i have put a mesh router really close to the powernode to connect it via cable.

the speakers work fine when connected to wifi as a single speaker, but once added in a home theatre group they just can't seem to keep a steady connection for very long.

I already tried factory resetting both pulse M's and deleting and creating a new group. All without succes.

any ideas what my cause this? i would love to keep them as it sounds great when they do work. but if it stays like this i would have to return them. i think it is quite a pricetag i paid for a promise of wireless rear speaker, so i hope you can deliver on this.

any ideas or help would be more then welcome.