2025 Buick Enclave - Ongoing OnStar / Battery Drain Issue

I have 2025 Buick Enclave as well. It started with On Star n navigation failing completely. They put in new OnStar telematics module and within about 2 months now battery completely dead overnight. Got it back to dealer and they are checking things out now. I have just also found on google search that the BCM. Bdy control module can have ether a short circuit or Parasytic draw. Which can lead to sporadic battery draw down as well. I’m calling dealer tomorrow to see if they checked the BCM as well. 
    I have also sent an email to GM CEO Mary Barra  email ( mary.barra@gm.com )this last weekend and she had an Exucutive administrative assistant reach out to me on Monday already. 
There are different lemon laws in different states. You need to check with them to see if you vehicle may qualify for that as well. I’m sure hoping they get mine resolved I really like GM but this is leaving a very bad taste with me to say the least. 

Thomas Beyer