Random speed WiFi

Hello everyone !

I am French, I apologize in advance for my English :o

I have a Moto X Play (update, Android 6, stock rom) and I have a "problem" WiFi lately :
The phone works fine, except that I feel that WiFi is crippled, but only through time ! When I make a speed test, I was about 1/3 of the available bandwidth (2-3 Mbps on the 11 available).

The problem is even trickier because the Play Store updates are no longer (continuous progress bar), and all the more strange that I am the only one to have this problem : Motorola Moto G2 x2, LG Fino and computers portable display normal results and no problems.

I tried to change settings of the box, without result (having graduated in Networks, I know about networking, but I may have missed a few things :confused:).

Here are the "tests" that I made, and that did not work :

• factory reset


• Using Wifi N (20 or 40 Mhz)


• Connecting to a WiFi repeater


• Enabling / disabling IPV6


• Using Conectify to create an access point


• Test on another box

I therefore appeal for your help. If you have ideas (without root the phone, I want to keep the Motorola warranty), let me know ! :D