Hey guys here my issue,  I have two deco M9 plugged into my house which are connected a couple of google home assistant / Chromecast audio

All from Google

When the two Deco are plugged , it is impossible to play the music on all 10 speaker at the same time , there is always a couple  that are struggling, and cut every  5 seconds...

When I unplugged the second Deco and  all my speakers are connected to the main deco, everything is working perfectly... 

The solution would be to assign each speaker to the same deco, but it is not possible... 

I insist that it is not a sync issue.

Anyone of you have the same issue ? Thanks