I received my X5 just three days ago and it is exhibiting new behavior (i.e. it is doing things it didn't do when I first received it). Every time the X5 powers on, it emits two audible clicks. I have no idea what might be going on except that those noises are new. I'm going to "break in" my X5 over the next week and hope it doesn't break. Fingers crossed!
Edit: I will attempt to capture the clicks on recording and post them here