RTN itself is not contagious, but is an indicator of stress. The source of that stress may be system wide (ie low Ca or red bugs) or local (too much or too little light or water flow in the location for that coral). The fact that it was fragged likely has less to do with it than other sources of stress it has been subjected to in your tank. You have not really given enough info to head you in the right direction for finding the cause... do you test your water? Do you have other sps that are doing ok? Was it RTNing under high light/ water flow? The fact that it survived 2 weeks leads me to believe it is something to do with your tank more than anything.
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