I've read you've already put in a fresh battery a couple of times, now I'm wondering if there's a cold solder joint in your ground wire.
When Ish responds back to you, and you get that buzz sorted out, please post back what was causing the issue and how it was remedied.
When Ish responds back to you, and you get that buzz sorted out, please post back what was causing the issue and how it was remedied.