Hardware version EU2.2. Firmware 1.2.8 Build 20190403 Rel. 40244.

A few days ago I purchased and installed an M5 mesh network at home (3 devices). I already have a TP Link C7 router which I wish to continue to use.

Per the instructions, I disabled the wifi on the C7 router and installed the M5 devices in Access Point mode. One device (the main device) is connected to my router by ethernet. The other two are distributed around the home. There are no other Wifi networks in the home.

The network works fine 70% of the time, giving excellent download speeds all around the home.

However, every so often our cellphones (both android and apple) and tablets (ipads) have difficulty with their wifi connections. In particular, my android phone seems to lose internet access and then loses wifi connection with authentication errors ("unable to authenticate" and sometimes "unable to obtain IP address"). Similarly, iphones and/or ipads lose connectivity regularly - even when they are not moving around the home.

All phones are setup to access the ssid with the correct password and all devices connect succesfully most of the time.

I tried a few things to resolve: I switched "fast roaming" on and off and the issue occurs in both situations. I tried with and without a guest network. I reset the router and M5 devices. I even reset the M5 devices (using a paperclip) and reinstalled from scratch to no avail.

Any advice? With the regularity of the lost wifi on cellphones the network is becoming unusable and certainly very unreliable. Previously I used TP Link EAC115 access points with none of these problems.