Wifi is slow for not reason
So my Wifi has started to be very slow. When I try a speedtest, my speed is sometimes at 5 to 10 Mbps while I have the 500 Mbps plan. I tried to reboot it and reset to factory settings, but the problem just came back. The light on my modem doesn't show any problems, I didn't change a single thing at home and all my hardwares are at the same as before. Does someone know how to resolve this problem ?