Well, what makes you know that it's when 50 units die that everything else dies? Just curious.
My suggestion would actually be to get SCMDraft, open it up with the text Trigedit (just hit the "triggers" tab on the top), and copy all the triggers into notepad. Then, do a ctrl+f search for "Kill Unit", look at all the triggers that use the Kill Unit, and see which one is the problem.
I'm not saying to actually use scmdraft for anything; infact, I'd recommend for you not to make a single save in scmdraft. Once you copy the triggers into notepad you can close the program and then just open xtra back up, because even without knowing the syntax, it can be useful for finding troublesome triggers.
Bah first of all i know its at exactly 50 kills cause iv tested my map many times and i cheked all trigger one by one so it prolly is just a bug or sumthing neway ill prolly start new map and fk this one its to much of a problem to figure wich trigger makes the problem cause i already made over 200 trigger and to tell the truth they all work perfect but prolly one that fk all my map well it pissing me off but...well its not my life after all LOL thx for trying to hlp