I've not come across anyone having transmission issues that I can remember. Hopefully it's a easy fix.. If you have any codes to read that might point us to some ideas, other than that we'll have to wait to see what the dealer says. Keep us updated!
I've not heard of that brand, how does it compare to line-x?
Line - X is my go to brand. I had one on my last truck and loved it.. had a much better texture and feel than Rhino Liner did.