So whenever I start a battle vs Dark Eldar, you hear the "Tyranid battle sound" or at least I assumed it belonged to them since it sounds like a roar and nothing like Dark Eldar.
During the Imperial Campaign after finishing Trayzin's first mission it would send me back to the main menu. Had to load a previous round save, replay everything then it went just fine.
I regularly see the warp disengage appear randomly on my screen without any ship being even remotely near.
All of this is with the beta patch, I didn't really have these bugs in the normal version though there I ran into lots of other annoying stuff.