When switching from the zweihander to the nail gun while playing as the berserker class, the feild of view often relocates to an entirely different direction. Often times I'll be running backwards while switching to the nail gun, then suddenly I've turned a complete 180 degrees and now running backwards towards the zeds I've been running away from, also I'll be looking up into the sky. This sends the first shot I get off from the nail gun into the sky and no where near target, usually taking a bit of time to gain my sights back to where they should be.