Correction...
Kernel 4.12 is working (I had inadvertently selected the wrong kernel on the Grub screen during my last test).
$ uname -r 4.12.0-041200-generic
I will continue to test 4.12 to see if the Bluetooth mouse unexpectedly disconnects.
Correction...
Kernel 4.12 is working (I had inadvertently selected the wrong kernel on the Grub screen during my last test).
$ uname -r 0-041200- generic
4.12.
I will continue to test 4.12 to see if the Bluetooth mouse unexpectedly disconnects.