I cannot recollect with what version of iOS this problem started. But, then one day, my iPhone started prompting for the Low energy connection from my QC35 ii (comes with a LE postfix). The prompt keeps coming back when I open Youtube or Youtube Music which I use very often. But, if I choose to connect to LE the Audio stops in next few seconds. It wouldn't work until I forget the LE connection from the phone's settings. It's too annoying. Is there a way this can be fixed or at least keep LE disabled.
* I am running iOS 11.3.1 (though this problem has been there since last few versions)
* I had updated the firmware to the latest version and just made sure again from Bose Connect that it is up to date.