I finally figured out the problem with my watch: it was the xfinity WiFi app, which interfered every time I left my home and my own WiFi network! I’d had to install the xfinity app temporarily due to having to set up a new MacBook after my old one died, and I’d also bought a new WiFi router, but needed a temporary internet access while getting my new system set up. Anyhow, once I deleted the xfinity app, all the problems disappeared. No more issues at all, either while in my home network or about town. I’ve talked to a couple of other people in my extended family since then who also had the same problem, and in every case it came down to the xfinity WiFi app. This happened even though I did not have my phone set to ask to join other networks! Hope this helps you.