I think most of the tangles occur when setting the dipseys out.Especially if trying to put out a 3 setting with the 1 setting a ready in water.Any fish on that 1 setting and will most likely tangle.I'm watching that 1 setting as that 3 setting going out on clicker.If I see rod move on that 1 setting, I will stop the 3 setting going out and reel it in.Another area that could cause problem is that dipsey going through that prop wash.I try and get that dipsey deep enough initially to miss the strongest prop wash.
The second area of potential tangles is when both rods out fishing and a fish is on a line without pulling the set lever.That fish will affect the position of the dipsey by its weight and movements.So keep an eye on the bend in rod and angle of the lines.If in doubt check em.