Few days ago I purchased Galaxy Watch 3. And since day one the watch doesn't stay connected to my phone. Some times it can't reconnect even if my phone is literally next the watch.
My previous watch was Garmin Vivoactive 3. Sure it is not as sophisticated as Watch3 but I never had connection issues. And I had them for over 2 years.
I updated everything there was to be updated: the watch software, phone apps, etc. The problem persists.
My phone is Huawei P20 Pro running Android 10.