What cause the Honda accord transmission to have gears shiftting problems?

101 problems could exist but most likely it was caused by a poor transmission design. There are hundreds of complaints on file with the NHTSA about the sudden failure of this car's transmission at highway speeds. The cause is related to an issue that required a 2004 recall of several Honda models for excessive heat buildup and gear lockup. The resulting fix put in by Honda slowed the rate of failure, but did not address the underlying cause. You should have the transmission inspected by a specialist. Most shops will not charge you to inspect it if you have service done, but be prepared for a "transmission failure" diagnosis.