I have a mid 2011 I Mac and have installed the latest security up date, so now running 10.13.6 (17G13033) After the update the Magic Mouse will not connect to the Mac. I have installed 2 sets of batteries to make sure however the apple bluetooth keyboard connect ok. I don't know if the mouse has died or its to do with the update, the mouse was working fine before has anyone else have the same problem.