I have a stock 2019 L5P with 100,000 miles on it. I drove it about 600 miles on a road trip last December and after about 5 hours of driving highway speed, I started to notice a stutter or almost a missing as if it were misfiring type of feeling (realizing this is not possible in a diesel) and it only happens at 1500 RPM at 70-75MPH. The trans temp was about 180 +/- degrees when it began. Since the trip, I have changed both transmission filters and refilled the trans with Transynd. The truck is having this problem more and more now and I am dreading taking it to the dealership for them to rake me over the coals. I would appreciate any advice anyone may have.