Hi, I had the same thing happen to someone using a Dell XPS 13 9350. I went in the BIOS settings and disabled Bluetooth from the wireless device and wifi worked again. Obviously if you need your laptop to be Bluetooth-enabled that solution isn't ideal but in the meantime it's better than nothing. Hope this helps.
 I've had the machine for roughly 30 days, and it worked fine.  Suddenly today, the wireless stopped working.  I'm running Windows 10.  In Device Manager, the Broadcom 802.11 adapter is failing, with the error message "This device has failed and is undergoing a reset. (Code 54)".  The driver version is 1.555.0.0. Please advise on how to further diagnose the problem, and/or fix it.  
XPS13 9350 Wireless Stopped Working Suddenly