Dead battery

[Jcp21]

Looking for some suggestions on a multiple dead battery issue on a 2020 Sierra at4 (5.3l).  
Over the past 6 months I have had roughly 6 to 7 times the battery looses its charge and will not start the truck.  The battery was checked twice and tested fine, on the 3rd time it was replaced, I didn’t bring it in the first time as I figured it was an anomaly.  Since the new battery it has not started 3x.  On the second time with no start they had already diagnosed a bad on star module that was just waiting to arrive for the dealer to replace (this was roughly 3 weeks ago).  
On Monday the truck would not start (it started Sunday with no problems), I could not jump start it with another car, a jump pack, or the tow truck.  The dealer currently has the truck (they charged the battery and was able to start it). Currently there is no draw showing that would cause the battery to drain.  They are keeping it hooked up and monitoring now

I am out of warranty (yes I drive a lot for work), and just looking for anything that can help point in the right direction.  The dealer has been great in trying to resolve the issue, but we are both confused as to what could cause this issue.   Each time the battery has died it was been in the driveway at home.

Not sure if it makes a difference, but the cylinder head was replaced due to a DFM issue

[Jay P]

Check this out. It may be your issue.

BUELLTIN.pdf

[Kikutwo]

Have the same issue with a 2019 Canyon V6. Thought it was from a USB cable that was plugged in. Tow truck started with battery pack three times. Just decided to be safe and replaced the battery. Just went to start it after sitting in the driveway with no USB cable for a few weeks. Stone dead, not even a click.

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