Bluetooth connection lost during sleep

Intel iMac frequently loses its bluetooth connection with a magic mouse during sleep and doesn't re-connect upon waking up.  A restart is used to re-establish the bluetooth connection. The iMac is a late 2012 model (2.7 GHz Intel Core i5, 21.5 inch screen).

as a workaround then I suspect that turning off the mouse and back on again will make it work
windows 8.1 have the same issue with my razor mouse not with my magic trackpad though
I disconnect the razor mouse and reconnect and all is good quicker then reboot

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