I need some help. Installed 2 Deco E4s, one linked to the wifi router via ethernet cable and another one 6 meters from it, with the PC another 3 meters from that. The wifi router's transmitting roughly 500MB/sec by default, but even the main deco fluctuates between 0 and 50MB/sec as per the Deco app. In practice it means every third second there is an outage when the data transmission is at 0 then it goes back to 50. That shouldn't be happening, should it? I've re-established the network a couple of times, tried with only 1 deco, tried access point, but to no avail.

Without the deco network my wifi can't cope well with the blind spots, but at least the speed is stable, if slow. With the network it's faster but makes work impossible due to the outage every third second.

Router (living room) - linked with ethernet cable to Main Deco E4 - linked to nearby Deco E4 in hall - PC 3 meters from that.

Any suggestions?