So basically I'd be on Teamspeak with him, and suddenly out of nowhere a SUPER loud static noise emits from his microphone, and I have to immediately mute my speakers to avoid ear bleeding...

I'd like to note he has Open Mic on always. To fix it, he unplugs his headset and then plugs it back in.

I'm not entirely sure if it's a Teamspeak problem or a hardware problem, but it's worth a shot asking here since I assume you guys might know a thing or two about microphones...

Any replies would be appreciated, thank you in advance.