Originally Posted by abapicaltaenia
Maybe one of the screws in your BD is loose. That happened to me once. It might be the EMAD ring as well, I've heard of them not adhering to the drum properly before.
Remove your emad, try older batter head and see if still happens.
If still happens tune reso up/down to check if it goes away.
If still happens, try a felt strip on reso.
If still happens return to forum.