Android service stops?

Question

Java

The service is started as Foreground, the notification constantly hangs.
The service is related to geolocation and should sometimes run almost all day until the user turns it off.
She collects several coordinates and sends them to the base, and so on all the time. Memory does not eat much.
But in the end, the service can turn off both after an hour and after 6 hours. The gun disappears from the screen. Works on android 8, 9.
Help =), I've already broken my head.