1st safety problem is while accelerating, there is a rough shift in gears despite being an automatic transmission. While attempting to gradually and safely accelerate, vehicle causes an abrupt deceleration where rpms drop and vehicle occupants are thrown forward during the process. Vehicle was brought to Ford Dealership for repair. They noted a known issue with transmission and completed a software restart/update. Vehicle gear shift improved slightly for short period of time but eventually resumed and is noticeably worse in colder months. This problem has been noticed while turning, resulting in near misses with oncoming traffic and is concerning when entering/merging with traffic at highway speeds. There were no dashboard warning light indicators at any point. Battery was in good condition. 2nd concern: Engine fire ups up on start but stalls while idling when shifting out of park as well as in stopped traffic. ‘Auto startstop, shift to P, then restart engine’ notification presents on gauge display. This requires multiple attempts to get vehicle restarted with following notification instructions and shutting off/restarting engine. Disengaging auto startstop on startup is inconclusive about remedying the situation. Battery was tested as good but replaced anyway due to age to rule out battery related concerns. Contacted Ford dealership service department and they replied, ‘they have never heard of it happening.’ They denied knowledge of any TSB, CSP or recalls/complaints about the issue. However, it appears this issue is well documented on multiple Ford models and various production years. Other than instrument/gauge display of ‘Auto startstop, shift to P, then restart engine’ occurring after the fact, there is no warning light indicators. Safety is at risk due to stoppage of traffic and loss of power/ability to accelerate or maneuver vehicle in traffic situations to include clearing intersections with oncoming traffic while turning at low speeds/idling.