Hi @Ashley_Phillips thank you for advice.
It is working much more better after factory reset.
It wasn't even painful at all I have reseted phone and reverted all apps besides pebble app, as I wanted to have fresh instal.
And it works, I do not receive many disconnect and most of notification are showing. Even when my pebble don't receive notification when i go to Airplane mode then back all notification get synced.
It looks resolved for me. If anything will change i will update you all.