The Logitech MX Master issue still persist as of today. The issue is with the Bluetooth chip in the mouse, where it will go to sleep intermittently and it lost connection with your MacBook. Logitech will not admin to the problem since the issue seems to be hardware related.
I tested this mouse with various MacBook (2008 MBP Pro, 2011 MBA, 2015 MBP, etc). and same problem. No problem with MX Anywhere 2 however.
The reason I got this mouse AND use Bluetooth is because it allows simultaneous connection to 3 devices - I can flick the switch at the bottom of the mouse and connect to my 3 MBP's (not at the same time, though). Using USB will require unplugging / plugging the USB dongle, which is not practical.
My suggestion: stay away from MX Anywhere Master. Use MX Anywhere 2 if you want the bluetooth switches.
I tested this mouse with various MacBook (2008 MBP Pro, 2011 MBA, 2015 MBP, etc). and same problem. No problem with MX Anywhere 2 however.
The reason I got this mouse AND use Bluetooth is because it allows simultaneous connection to 3 devices - I can flick the switch at the bottom of the mouse and connect to my 3 MBP's (not at the same time, though). Using USB will require unplugging / plugging the USB dongle, which is not practical.
My suggestion: stay away from MX Anywhere Master. Use MX Anywhere 2 if you want the bluetooth switches.