[jblackburn]

Odd, I've actually seen mine switch between modes on its own without issue. Galaxy S8 on 7.0 here. Do you have location for Google itself or something turned off or any system packages disabled on your phone?

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[jblackburn]

2016(.5) with 8" display. I've seen it switch as the sun goes down - ~5 PM as of late. I don't know if it's the car or the phone that makes it switch modes to be honest. It closely coincides with the auto lights turning on, but I don't know if it happens at the same exact time or not.