Good luck, I hope it is fixed for good.
I have to say that the 8-speed on my new Ram performs flawlessly (just as they did on my previous Rams). My last truck was a 17 GMC Denali, the GM 8-speed is a far cry from the ZF unit which is a much smoother transmission.
19 Ram 1500 Laramie LongHorn Hemi, 87 Monte Carlo SS, 14 Mercedes GLK 350 (wife's)
One of the "Quiet Professionals"