These complaints are all consistent in that affected players report constant crashes, freezing and strange audio loops. EA has released an official statement on the forums:
The launch of Battlefield 4 is in full swing and the majority of our fans are having a good time. We’ve noticed that some players on PC are experiencing crashes, something that we understand can be frustrating. Rest assured that we are working to address these issues.
This is then followed by some potential fixes. It’s important to note that this update topic is 61 pages long after the initial post.