Had another look at this larger project as you mentioned in the other thread that you weren’t rolling the player object here.
We can now reproduce the issue almost 100% of the time and have a video recording of the issue so we should be able to investigate it more thoroughly. Hopefully we be able to find the cause and solution soon for this.
Edit (26th Oct 2016): Add as a bug in the engine GitHub repo: https://github.com/playcanvas/engine/issues/759