What causes Netsplits?

I just finished making my map and thought I had worked out all the bugs...
Now I am plagued by netsplits which occur within the first minutes of the game..

Can anyone suggest the possible causes for netsplits?

For those that don't know a netsplit is when players leave, but they are actually still playing and there was no lag involved, the game just gets split up to maybe 2 groups perhaps more... so annoying :/

Splits can be caused by triggers that send information to say, 1 computer instead of the group, and then that person desyncs. I think thats how it works.

There are some other interesting things that cause it. Do a forum search on net splits (try searching the Trigger Haven forum, too).

Otherwise, give us some details about your map, so that we can see where net splits might be happening.