Some has experienced similar issue. I’m assuming you are using an Android head unit that goes to sleep mode when you turn off the ignition.
This works perfectly fine on our Joying and Ainavi devices that we have. Also, we have found no issues with any of our phone and tablet test devices. Unless I can reproduce the issue, there is nothing I can do about it.
I can try to take a look if you send a debug log if this happening:
How to send a debug log - General / Frequently Asked Questions - RealDash Forum