Disconnects on iOS11 and 6.0 firmware

I've upgraded to iOS 11 on my iPhone 7 and updated my Fenix 5X firmware to 6.0 about the same time, so I'm not sure which of those two is to blame...
Anyway, what I've been observing since, is disconnecting my Fenix from my phone and issues with reconnecting it back. I can only enforce connection restore by going to Settings, turning BT off and on and then waiting approx 2-3 minutes. The I need to enforce Garmin Connect to be shut down completely and re-run it. This brings the connection back.

Otherwise, even though Fenix is visible in Setting as connected via BT, the Garmin Mobile app claims it's not connected and refuses to sync.

I strongly believe it's the iOS 11 issue, as this system is super buggy and I'm experiencing other issues as well, and many others are reported by different users. Regardless, what I'm looking for here is obviously an advice how to overcome the connection issue. Any help will be much appreciated!