I always use the improved clinch knot to tie my hooks to the line, which is mono. Generally I have no problems but occasionally I lose a fish and see that the knot slipped out. I see the telltale waviness at the end of the line. It hadn’t happened for weeks but then it happened twice in the last two days.
I’m not sure what exactly is going on. I tie with six full twists. I moisten the line before pulling tight. I pull on the hook to tighten, gently at first, and coax the coils down with my finger. After it’s all in place, I pull on the hook pretty strongly and see no slippage at that time. Finally I cut the tag end, but not super close.
I’m thinking of learning the palomar knot and switching to it.