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Could be your arrows. what draw length? What poundage? What's the brace height? How many fletch? What weight broad head? What spine shaft? This info may help others determine a cause.
i have the same bow and shoot it as much as you do , i agree it could be the arrows, have you also tried a walk back test ? are your groups off at all ranges? also i found that i needed a longer stabilizer. went from 6" out to almost 12" and it helped.