This is closely related to JIT Failure, mentioned last time in this thread, but only happens when you are learning a new song and, naturally, are playing it a good deal slower than full speed. What seems like a perfectly reasonable sequence to perform with your right hand picking fingers at a slow speed soon becomes an impossibility as you increase speed. Usually, what appeared as a slow pair of sequential thumb picks speeds up to reveal a much more demanding sequence. You have to go back and relearn that part using a different picking finger for one of those notes.
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