As I said in the first post, I switched to the beta version to eliminate the need for active/background app requirement. I was having the same connectivity issues and thought that maybe that would help. As I stated in the another post, I did several before (pre beta install), and after (post beta install), and am convinced that it solved the lost of notification issue. I went over 6 hours without the app being available and was still receiving notifications.
The connectivity issue is that when I start up the app, I get message (24), that it cannot connect, (I think for syncing), and tells me to retry. If I look at BT on my phone the WYZEBand shows as connected…retried to connect as message says and I get the same thing again. So far the only working solution to get reconnected is to “reboot” the Band, “forget the device on iPhone BT, that’ll usually cause it to re-pair. I’ve also had to “reset” the Band and that worked as well but is more of a “pia”. Again, I had this issue with both versions of the app.