Won’t reconnect at background after several hours of parking (iOS)

If the car is parked and the app is slept for several hours, the app won’t reconnect to the charger nor the app won’t update the status when I started to drive again automatically.

I can guarantee that the settings on my iPhone is correct, and the charger works as it charged my phone.
This is an intermittent problem. Sometimes the app works flawlessly, but sometimes the problem happens

iPhone SE
iOS 11 (all versions of iOS 11)

I’m having the same issue with the car finder/charger and the tire safety monitor kit. i have to restart the app to get it to connect again. i’m using an iPhone 6 iOS 11.0.3.