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I vote to forego the policy of "Pics or it didn't happen."
Could be. Trying to rule out obvious things.
It sounds like the neck heel on the bass side is high....have a sighter down the neck from the butt end, anything obvious....or subtle?
Make sure your neck isn't twisted by sighting along it. Then make sure there are no loose parts that could buzz from the vibration, like...
3mm!? Are you parking your truck under the strings [emoji14]