When I was setting up my ham radio to use the trailer brake socket which delivers low-voltage DC current, the power went off for some reason. This was not an issue when I did the same with my 2017. I also depended on the power remaining on when I left the car so the radio could retransmit incoming traffic. I did more research on the power socket to discover that it's supposed to turn off when the vehicle goes dormant--as when the driver leaves. Thankfully, the power can remain on if the car is in Dog Mode... 
