maybe your kml exceeds the Size and Complexity Restrictions for KML
Rendering in Google Maps
http://code.google.com/intl/de-DE/apis/kml/documentation/mapsSupport.html

i had the same problems with kmz files until i switched to fusion
tables layers:
http://code.google.com/intl/de-DE/apis/fusiontables/
http://code.google.com/intl/en-EN/apis/maps/documentation/javascript/reference.html#FusionTablesLayer

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