I woul also check the snap to see if the edge of the eye has any rough edges.
I had a line snap at the swivel, and when I checked the swivel I could feel the sharp edge, probably caused by clipping the old mono off with nippers. In a case like that I just replace the swivel as well.
Once I've tied a good knot (palomar or modified cinch), usually the only thing that can break it off is me when I change it due to the middle section of mono being frayed.
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