@Wayne-TP i tried all these and the problem persists. I tried connect the h500 to the main deco both using wireless and lan connection. H500 crashes my deco mesh ALL the time. And TP link doesnt...

@Wayne-TP i have exactly the same issue (but with x60 deco). it totally ruins all the deco mesh. when i disconnect the h500 the problem disappears. i tested both in wifi and lan mode.