Sounds like this aren’t supposed to happen. Since I made this recording, I’ve heard more sounds like this happening during all kinds of functions: even just switching between apps. I closed all the apps sitting in the “multitasking” bar at the bottom, and it’s still happening.
If anyone is experiencing this or knows a fix, let me know. If it continues, might be worth a trip to the Genius Bar. I don’t like it, I tell you!