After maintaining Category 5 status for about 12 hours , Ivan began a steady weakening trend due to another eyewall replacement cycle until reaching winds of 140 mph ( 225 km\/h ) on September 10 .
After maintaining Category 5 status for about 12 hours , Ivan began a steady weakening trend because of another eyewall replacement cycle until reaching winds of 140 mph ( 225 km\/h ) on September 10 .