I just received my brand new Dell XPS 13 and i was able to connect 30min before the wifi connection started and never stoped for the past 2 days.
folowing every other tips and drivers update, installing old drivers, but nothing worked. restarting or deactivating the wifi card didn't do anaything also.
Only way to get connected is to either restart the routeur (note that it's use by the whole company with no one with wifi issue on their HP laptop so i cannot restart it) or through a USB shared connection from my iphone connected in wifi. This is ridiculous to have so much pain with a new computer.
As of now, here the configuration
Laptop Dell XPS 13
Windows 8 64 bits.
Wifi card: Intel Centrino 6235
Drivers version: 15.6.0.19
Wifi routeur: Orange livebox Pro - b/g/n - WPA/WPA2 (TKIP/AES)
Lookinf forward for a prompt answer from intel to fix this driver issue.
thanks