NHTSA Complaint #11594864 — 2014 KIA SORENTO

I own a 2014 KIA Sorento 2.4L LX FWD. I have been experiencing a problem with my car for about two years. This usually occurs when driving up a hill and the transmission downshifts and I experience a jerk, either from the transmission or engine and the rpm drops to zero. The transmission will not shift from the last shift point. Most times it will be in the drive for final gear. You can increase the vehicle speed by pushing the accelerator all the way down. We were coming back on vacation two years ago and was driving in the left lane on an interstate. I experienced the symptoms and the rpm dropped to zero. No downshift or up shift. I managed ti find an opening in traffic to get over in the right hand lane and exit. Once I came to a stop, I tried to accelerate but engine struggled. I turned off the engine and was able to restart the engine and it operated properly. Had rom, transmission shifted properly. This was an unnerving situation. I felt very fortunate that I did not have to evade a dangerous situation on the interstate since the transmission would not shift and I could press the accelerator to the floor to gain a little extra speed. Any help will be appreciated. Thank you.