Does your bow hand ever get out of sync with your fingers?
One reason could be this: your left hand and right hand work in a series of sequences, not exactly perfectly in time with each other. The lefthand finger has to be in place before the bow moves, or we hear a little bit of the note that came before. Likewise, for string crossings, the crossing takes place after one note and before the next; it doesn't take place at the same time as the next note. If we send the command, "Do it at the same time!" to both hands at once, the results are likely to be very mixed. Instead, the command needs to be: "Fingers, then bow."
Of course, these finger placements and string crossings take place in a matter of microseconds between notes, so one has to be very coordinated to make this happen. But how can you practice that coordination, when there's so little time between notes? The answer: put it in super-slow motion. The passage might be easy; it might be something you feel you can and should be able to play fast. But the reason for the slow motion is simply to practice the sequence: finger first, then bow. String crossing first, then bow. If you've been telling your fingers "same time!" you may actually find this little exercise to be a challenge! But once the sequence is well-ingrained, you will find, when you speed it up, that your passage is very clean!
Here is a little demonstration for you. Happy practicing!
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