Help! Cannot diagnose the problem!

Reaching out to you fellow Tundra owners in hopes that maybe someone knows what could be happening with my truck.

I have never had any mechanical issues with my work truck until about a month ago, when transmission started noticeably slipping on my 2013 Tundra (at 88K miles). Luckily still under "platinum" warranty. Took it to the dealer, two days later dealer confirmed that the truck needs new transmission. Allegedly transmission was replaced with a "refurbished" one. A week later I get my truck back and drive about 20 miles away from the dealership when the truck starts acting up again. The acceleration is lagging and the truck is super jumpy. I nearly stalled twice on the freeway on my way back to the dealer. They take the truck back. A week later they call me and tell me that the problem is due to uneven thread wear (I had recently replaced a flat tire). This made no sense to me, because my truck is 4x4. As far and I know, this only applies to symmetrical all wheel drive. Anyway, they put new tires on my truck and let me drive around for a couple of days thinking that it would solve the problem. It did nothing. They scratched their heads and sent me home. According to their road tests, the new transmission is shifting fine and there are no other error codes present. They claim they could not replicate the problem on their test drive.

The truck is not safe to drive and I need it for work, so I took it to a different dealer. Went on a test drive with them, felt the problem twice. They have recorded the test drive data, but cannot pin point the problem. At this point it's been over a month, nobody can find the problem. I have reached out to corporate, opened a case requested they send an engineer. Has anyone had anything similar happen, when truck was not well post transmission replacement? I take care of my truck, all recommended services have been done at the appropriate times. Any ideas?