NHTSA Complaint #11434519 — 2017 FORD FOCUS

On multiple occasions while driving on highways with speed limits 55 or greater the vehicles suddenly de-accelerated rpm dropping to 1-2 rpms and suddently without warning then accelerating to 7-8 rpms, cars and trucks. Appears that the transmission gears were switching without warning and without operator shifting. Took vehicle into John F. Kennedy Ford in Conshohocken Pa., they replaced clutch plate, then we experience the symptom even words on highway, while operating a 55mph with car suddenly de-accelerating. Car under extended ford warranty 60k miles. John F. Kennedy Ford dealer in Conshohocken and Ford Corporate after calls to customer service corporate line speaking to supervisor refuses to repair the vehicle because they say they can not recreate the problem. (witness was present during each incident other than driver) Incidents occurred 09/05/2021 on NJ Expressway and 09/12/2021 on Pa Highway (09122021 occurred after clutch plate was repaired to "fix the problem" My personal opinion is that Ford customers are going to die on the highways if this problem continues. It is extremely dangerous and unsafe due to uncontrolled rapid de-acceleration on the highways.