I have the same issue of the steering locking up at higher speeds (over 30mph going out and usually coming back on under 30mph) and i've taken it to 2 dealerships without either being able to fix it. It's very dangerous and Jeep seems to not want to help in fixing the issue.I have a 2018 JLU sport s. The other night I went to drive after it had been sitting for a few days. When I started pulling out of my driveway, I noticed I couldn’t turn towards the left. The steering was locked up. I stopped and played around with the wheel. After turning it to the right, it then totally locked up on the right side too. Took a lot of force to finally get it to break free. I took it to the dealer who wasn’t able to replicate the issue. They tell me they’ve never heard of this happening. They are going to do the TSB to replace the steering box but they told me they can’t guarantee it’ll help with it locking up. They said the TSB is for excessive play in the steering, which I do also have, but doesn’t mention anything about locking. At this point, I’m nervous to drive it. Thankfully it didn’t lock up while I was on a main road, but what if it did? Definitely could have been dangerous. Has anyone experienced a similar issue? Did replacing the steering box fix it?