Warranty is a good thing, but it is not forever.
So, second transmission in 4 years it is too much. What can be a root of the problem?

1. 33" BFG?
2. Transmission cooler? May be the level of cooler is too high?
3. Incorrect level of ATF. I did not check the level, when new transmission was installed. And the quality of work was so bad. Some bolts was loosen, and some of them even not exists.( This time I will check everything).
4. Powertrain Control Module (PCM) failure?
5. Just my luck?

If it will broke again, I think dealer will refuse the warranty. I do not want to be in that situation.