I've had a Dell Latitude 7350 for a few months now, and it's had this issue since buying it. I sent it in to the repair depot twice, and they claimed to have fixed the problem by replacing various parts (main logic board, daughter board, speaker, etc.), but it is still here. I'm at a point that I am just living with it because Dell support does absolutely nothing to help.
The issue is that the laptop will make a weird buzzing/static/clicking noise that seems to come from the bottom left speaker or from the base of the laptop where it meets the keyboard. The issue comes randomly and cannot be replicated on demand, but it's incredibly annoying. When the sound is happening, disconnecting the tablet portion will make the noise go away, but reattaching it will make it come back.
The sound is like the video below:
(Please visit the site to view this video)
If anyone has any fixes or is experiencing the same problem, please let me know.