Within the last two weeks I have had issues with chronic notifications on my Vivoactive S4 that it is disconnected from my Iphone and then it reconnects. This sometimes happens several times within a minute. The only things that changed at the time this started 1 I replaced the band on my vivoactive and 2. I received an iOS update and it seems to have begun within 24 hours of the iOS update. I have cleaned all the contacts, turned blue tooth on and off, deleted the Vivoactive from the blue tooth list and then did a new add to re-add the device to my phone I have rebooted numerous times. I am to the point that I just turn off blue tooth on my phone and then turn it on to update, and turn it back off to keep the thing from driving me insane. The most recent update took me to iOS 14.4 and the phone is a iPhone 8. I really hate to turn off blue tooth and then back on but until I figure out what is going on and get it resolved my sanity is worth a little extra effort.