So I never use the Vex. I was using it today to do the fusion rifle pvp bounty and it started glitching out on me. At some point in the game it started charging like a normal fusion rifle before then going full auto. It got me killed due to this. I've seen several posts from 2014 where people noticed this. Apparently it's still happening as of 9/6/2015. That's ridiculous. Bungie, please take note! Here's a video of someone who experienced the issue and was able to record it. https://www.youtube.com/watch?v=q_yUIis7sEA