From what I read, if this happens every 4th frame, IMO, it's not the ball, but something in you , mental game. Could you be 'pressing it'? watching scores ? needing something extra on the ball ?
I just can't see where any ball, every certain number of frames, would do that, then the next frame go back to it's normal reaction, without something in you being the cause.
This is not a slam on you, I just couldn't see any other reason your ball would do this , then go back to the 'normal' reaction. I'd say you might want to check your mental game, pressure, feeling you need more on the ball , something in that area, more than the ball it's self...JMO
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AZ Guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.comSleep is over rated.