I have the same thing happen late in league. I have observed that as I fatigue (or lose focus), I become lax on my release, turning the wrist too soon. Sometimes I roll a perfect shot, but the ball seems to lose break downlane. Then I realize my lazy hand is losing firmness upon release. That's when I go back to release drills during practice sessions.
At those times, I recall the scene from the original Karate Kid where Daniel is getting the stuffing kicked out of him in the tournament and he is scared and starting to panic. Mr. Miyagi says......
"Daniel San!!!!!!"
"Focus!!!!....."
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