I tried using two of the AC1200 range extenders in a 2200 sqr foot house (not just because of size, but because of tile walls) and there's been an almost constant conflict between them. If I reset...

I tried using two of the AC1200 range extenders in a 2200 sqr foot house and there's been an almost constant conflict between them. If I reset all wifi, including main router, they work well for a...