PR sound bug

I have a bug that causes my sound to glitch every time I start PR with my headset plugged in.
Upon startup my sound will switch between my monitor speakers and my headset rapidly (every two seconds). Sometimes it will stop after the logo fades away, resulting in loss of game sound (other sound still works, ONLY PR is affected (even mumble still works)). Other times it will continue indefinitely, even after PR is closed.

Changing settings has no effect. Screwing around in the mixer or control panel has no effect. Reinstalling drivers has no effect.

This problem arose without warning about six months ago (no settings were changed, no updates came out, all I did was close the game and start playing an hour later)

It followed me from win 7 up to win 10, so I'm pretty sure its not my OS.

Aside from the infuriating sound bug, the game plays fine.

I have a Logitec G35 headset.

At the time of writing this, my headset and speakers are not functioning (even though the computer says they are). If I restart my computer, everything will function normally until I start PR