Wifi disconnects after 2 minutes

I have 2 laptop connected to my freebox in wifi, no problem, my pc connected by ethernet fixed, no problem, and third (sets) with a wireless card MSI disconnects after 2 minutes.
The connection is no problem, I open a browser, and it disconnects. Panel> Network Connections> I must return to my wpa key, 2mn quiet connection, disconnection and hop ... I have a message like "windows did not find a certificate to connect ...."

How to solve the problem? I checked the connection of the wireless card (pci) it does not change, I even reformatted and reinstalled windows .

How strong is the signal after you connect?
Turn your security off for a bit and see how long you stay connected
Disable UPNP on the router