Is your Pebble Time disconnecting from your Nexus 6 quite often?
Android 6.0 (Marshmallow) introduced a feature called Doze to conserve your battery life.
Whitelisting the Pebble Time app may resolve your disconnect issues.
That should resolve your Pebble Time disconnect issues.
If it does not additionally add the Android Wear app to the Not optimized list by following the above steps.