The Host role is reassigning without notifying or interaction from the Host/Co-Host's.
I routinely join a meeting from a PC then join with a smart phone in order to demonstrate phone functionality. Recently behavior has changed and now it will randomly change the Host role to the smartphone without notice. As the Host I have no control over which device is the Host. This is problematic because the Record feature follows the Host and now it's on my smartphone instead of the PC.
Have also heard from others that the Host has reassigned another attendee as Host and it switches back to the owner of the meeting without notice.
I recommend that the Host role should stay with the first device that joins the meeting unless changed by the Host. Once the role is changed by the Host it should not change again.