I just bought Forrunner 945 and had no issue pairing with my iPhone11 at the beginning. However, it suddenly unpaired a few days later and never pairs again. I re-installed the app, reset the watch to factory setting, changed the App account, etc etc, but it never pairs. I tried my family's iPhone 12 and 8, and it paired with no problem. Did anyone have the same issue? Is there any solution to such issue?