I was using 12lb UG attached to my tapered leader. The issue was on the UG side of my surgeon's knot, which hasn't been a problem in the past. Either I had a casting knot or kink that missed the periodic inspection or it just degraded over a few days. FWIW, that knot had already caught a couple fish. I'm afraid my 2 year old is gonna start dropping the f-bomb with the turrets I've developed.