I signed up just to leave this comment as your thread helped me out. My LX3310 was doing the same exact thing as yours where after about 20 minutes of running it would lose all power, especially when I had the AC on. My local dealer picked up the machine yesterday and today I got a phone call that there is a bulletin posted where the injectors need to be changed under warranty. My tractor is a 2021 with 151 hours if that matters. I printed this thread out for them and they confirmed it with their internal bulletin. I think he said that as soon as the coolant got to 60 Celsius (don’t quote me on the exact number), the tractor automatically goes into limp mode because of the injectors. He did say that since this isn’t a one off and that it was posted on a bulletin, the injectors are a new upgraded type which won’t have this issue in the future. They are swapping everything out and I should have my tractor in about 7 days. They’re just waiting on the parts to arrive before they can start the work. Thanks again for posting this thread. Hopefully others with this issue will be able to get help from these posts.