Camera jitter in Unity 5

We're working on a new build of End Space and we've been noticing this weird camera jitter showing up sometimes. It consistently shows up at the end of a level when the level end GUI pops up and causes all the GUI elements and the cockpit to shake. It also appears at other seemingly times but then usually just on GUI elements. I recorded a video to show you what I mean: https://youtu.be/nhgLI8nai_0

Has anyone else experienced the 'jitter bug' (now you've got this stuck in your head, right?) or does anyone know what is causing it? It's present in Unity 5.3.5p7 and 5.4.0f3 on Rift and Gear VR