Transmission shifts erratically causing loss of power at highway speeds. Transmission issues have occurred since the first month of ownership. Truck lunging when in park, down shifting from 10th gear to 7th at highway speeds, etc. Early problems/concerns were mentioned to service advisors when the truck would be taken in for service but I was always told, that is just the way that the 10R80 works. As time progressed, shifting issues got worse. They significantly increased after the powertrain warranty expired. Currently the truck shifts erratically in low and high gears and frequently experiences a complete loss of power travelling on the interstate. My biggest concern is that this is a known issue by the Ford Motor Company that has not been properly addressed via recall. The CDF drum inside of the transmission has a known design flaw and has been revised to eliminate the issue. The web forums dedicated to the F150 and any other model of vehicle ford equipped with the 10R80 are littered with similar stories and concerns regarding the transmission. ultimately, with the total loss of power at highway speeds and the need to immediately vacate lanes of travel to allow the vehicle enough time to figure out what gear it needs to be in, or to shift appropriately to regain highway speeds poses an immediate threat to any vehicle equipped with the 10R80 transmission and the original, or any early design, CDF drum. I would also like to note that I entered this with the most recent occurrance of this issue. It has happened multiple times during the course of ownership both before and after the warranty expired. Unfortunately, all of the Ford service writers/techs/managers, claimed that it was normal operation of the transmission.