I am another new 2538 owner with popping out of gear problem. Happened twice with 25 hours on the unit, while mowing with 6 foot finish mower. Happened once turning right going up a slight incline, then again about 20 minutes later while turning left going down a steeper grade. If I had been further down the hill I might have been sideways into a fairly deep ditch. Both times was in middle range and about 1800 rpm's. Have contacted my dealer. He called me back next day said the field rep indicated he had not heard of this being an issue (this was a week ago last Friday). He said the rep asked if I would continue using the tractor and take detailed notes if it happened again. Just on this forum alone that's about four or five with same issue. I really like the tractor but this is a troubling issue. I hope all 2538 owners with same problem will let it be known so we can see how widespread it is. Meanwhile I suppose I will go with their suggestion and put more hours on it to try and help identify the problem. The sooner the fix is in the works the better.