This used to be an ocassional issue but it has become frequent, almost daily. I all of a sudden get slow Internet speeds and then run a speed test only to realise that I am getting less than 10 Mbps on a 100 Mbps connection. The speed reduction is always around the same mark. When connecting over a LAN cable directly to the ISP router I get 100% of the speed.

I have the latest firware and the operation mode is set to "Wi-Fi Router". My sceond M4R AP is used as a repeater. I've tried turning off the repeater and move close the main AP but the speed still remains low regardless of which AP I am connected to. Usually after a restart of both devices I start getting my regular speed again but recently I had to restart it multiple times to start working properly again.

This problem keeps coming back. Is this a known issue?