Why on Android 5.1 and 6.0 does the connection with the Pebble watch randomly break?

Question

Android

Why on Android 5.1 and 6.0 does the connection with the Pebble watch randomly break? I can't solve this problem at all. Disconnection occurs randomly and does not depend on time. They do not automatically connect again, you have to manually connect the phone-watch back. The problem is not observed on caf versions of Android of the same versions (5.1 and 6.0).