I disabled 5ghz wifi, nothing changed. I changed also the wifi channel of the AP from auto to 1, N mode only and 20hz frequency. I got some more speed and stability, but didn't solve, I still have...

Model : Hardware Version : Firmware Version : ISP : Access point: 2x TL-WA801ND v2, firmware version 3.16.9 Build 150422 Rel.54631n Channel set to auto, mixed mod b/g/n, different SSID for router and...