2024 Model Y completely unresponsive - advice

Hi all

My 2024 model Y has approximately 54k miles on it. Yesterday, out of nowhere, it gave me a “unable to support features” warning and 15 minutes later the car was completely dead. Couldn’t open doors trunk nada. Car was towed to Tesla. This afternoon Tesla called and said the 16v battery cannot hold charge. They do not know why. They asked me to authorize a replacement of the 16v battery so they can see what’s draining it. Apparently they don’t have a battery they can use. Any idea what might be going on? The timing couldn’t be worse. I just got laid off and now my families only car is done. Oh they finally gave me a loaner.