oh for pitty's sake!! we can't seem to find a common pattern or fault here.
My other thought is that the bikes are leaving the factory with different software versions too, depending on when the bike was built.... which is why we are seeing different results depending on what hardware owners are using
Not trying to rain on anyone's parade Yans, just trying to prevent you or anyone reading this from buying new phones and/or headsets only to be left with the same issue. As far as Bluetooth 4.x is concerned, there is on this very thread a couple people stating they experienced spotty connections issues (20s and 30k). I asked my delaership to check if any update was available for my bike and there was none yet last time they connected it to the diagnostic computer.
There IS a common pattern tho...
BMW TFT KOMBI.
Issues are pretty consistent across the board, with a good mix of phones and headsets. The issues lie 100% on the only common component we all share.
So, to summarrize here's what I call the "standard" issues :
-TFT randomly failing to pair with headset at times (Phone connects but BT icon flashing endlessly while headset is not).
-Phone calls being devoid of sound, essentially preventing accepting or placing phone calls
-TFT display randomly not displaying any image, but otherwise working fine in headless mode.
-Connection with the Connectivity app randomly not working, preventing music control via TFT or Navigation (essentially fixed since a couple app updates)
-Album art randomly not refreshing / syncing with tracks or displaying totally different cover
If you experience any of that, DO NOT scrambly to upgrade your phone or headset, it won't fix the issues.
BMW need to acknoledge and fix this mess!!! At this point I acquired the conviction no amount of user fiddling can fix these issues. My only hope is it's something that can be fixed with a new firmware or a software patch.