Deco M4 unstable speed
Using M4 in router mode. Main unit and slave units are pretty close. 100 Mbps upload and 100 Mbps download from ISP.
Usually, I got 100 Mbps Wifi everywhere. This is what I expected for this set of mesh system. However, sometimes, the Wifi speed just drops, and it may last a while (at least half an hour I guess) before resume normal by itself.
When the Wifi speed drops, often, the wireless download speed may be around only 15 - 60 Mbps, and the upload speed is much worse, like 2 - 15 Mbps. If I connect to the main router using a cable, the speed is much better, like 70+ Mbps download and 70+ Mbps upload (but still lower than 100 Mbps).
This looks like a software issue of the router. I tried to turn off different settings in the Deco app. Now I run the M4 with almost everything disabled. No QoS (set to 1000 Mbps with no high priority device), No IPv6, even no monthly report. Still, the drop may occur.
Is this something that can be fixed in a future firmware update?