My Vanguard has been crashing since yesterday. I finally fixed it. Turns out the Operator skin "Decorated" I unlocked for Daniel is glitched. I switched back to the default skin "Marksman" and my game hasn't crashed since. Hope this helps.

One of the guys I listen to on YouTube states that a fix is coming for that in the next Title update on Tuesday!

https://www.youtube.com/watch?v=ch7Mc7ciEo0