I found out, rather unfortunately, that when I try to create a split connector past "Z" FlexSim will crash. It seems to only do this when I'm relying on the auto naming increment - if I rename some I can have more than 26, but its does not seem to be able to increment past "Z".
If possible it would be nice if the increments could continue past Z (ie: X, Y, Z, AA, AB, AC ... etc)