The connection issue was resolved with DISABLE wired backhaul from switch to 2 satelite units. The wired backhaul was set at day one. For same reason, the Deco system suddenly malfunction at...

My Deco Mesh XE5300 (3 units) suddenly lost internet connection at middle night on 7/31. Tried to reset with new name then turned to intermittent. Confirmed ISP okay. Now have to use my old AC2600...