Now leaving that MTP thing aside, that doesn't explain why Bluetooth would stop working. So, since it seems you know everything, can you explain why would Bluetooth stop working on 2 different devices. the only available explanation is bad design or manufacturing. I would like to hear yours.
After a few hours with v4.65, it appears that the Bluetooth communication between Apple IOS and the 5X Plus has been improved. The app no longer needs to be open on the phone to receive Weather and Calendar data updates.
I will have to test things a bit further to see if battery life is impacted, if the music feature drops or skips while a Bluetooth connection is established with the iPhone during activity, or of the RD Pod, Foot Pod, or other ANT+ sensors interfere.
Looks good so far, assuming there hasn't been any other regression, but please fix the CIQ date bug!