NHTSA Complaint #11601608 — 2020 LAND ROVER RANGE ROVER

In June 2023, I started my car and I got 2 error messages "Hill Descent Control not available" and "OK to drive with caution stability control not available", then when pressing the brake, it was very difficult to press the brake and stop the car. I took to the dealer and they replaced the secondary auxillary battery. In July 2024, I started my car and received the same 2 error messages and had trouble using my brakes again (same issue as in 2023). My car is again at the dealer, and I am told that the secondary auxiliary battery has failed again, and they can't figure out why. This seems to be a serious and dangerous situation, and I read online that there have been other complaints from other owners. My 4-year/50k mile warranty expires in October 2024, and I would like Land Rover to cover any future issues (at the very least) following the warranty period since this seems to be a recurring issue.