Occasional and seemingly random crashes, xps13 2015 running Ubuntu 15.04

I bought the Windows version due to not being able to wait for the developer edition. I installed 15.04 and it fixed all of the issues that I had before with 14.04 but for some reason I occasionally get full system crashes.

Everything is unresponsive and the caps-lock key crashes. I've managed to trigger this occasionally when changing wireless networks so not sure if it's a driver issue?

I was hoping that Dell would release the Factory Developer edition image so that I could install this for a fix but there doesn't seem to be. Any thoughts?