I recently deleted and reinstalled Samsung Health and Wear apps for my S9 phone and Galaxy watch to overcome a "step counting" glitch.
Whatever I downloaded created a big watch improvement. In addition to steps now registering correctly I noticed a big improvement in Bluetooth performance. Before, the watch couldn't connect with the phone on the other side of the house. This morning for the first time it does - thru 3 walls and 30 feet. Fluke? Improvement? I don't 't know. But thought I'd share.