I lost two sets off the dipsey on Saturday fishing Lake Ontario. The salmon were hitting and running past the dipsey and cut the leader between the leader and dipsey. Lost two flashers, a fly, and a meat rig! When we reeled them in there was about 12" of line past the dipsey the was frayed. It was brand new 30# P-Line. Can't remember that ever happening before so it's crazy it happened twice in one day!
BTW...if the mono was wrapped around your wire line, there's a good chance you were letting it out too fast. When you let them out fast, the dipsey tends to spin.