IMac wireless mouse/keyboard unavailable after awakening from sleep - OS X 10.10.3

I am using an iMac21 inch late 2012. Has been working perfectly until I upgraded to OS X 10.10.3. Now when the iMac wakes from sleep neither the mouse or keyboard are connected. The only recourse is to force a hard restart with the power button.
i have tried the following to no avail:
SMC reset
PRAM/NVRAM reset
reboot (reconnects until computer sleeps & reawakens)
bluetooth off/on
repaired Bluetooth devices
Removed & reconfigured devices
I have set sleep (in Energy Preferences) to wait indefinitely & that has 'resolved' my issue. Albeit with an increase in energy use. Of course this isn't a fix.
I Would be grateful if anybody had some tips on how to resolve this situation.
thanks
paul

By the way, are you seeing something like this in your system logs?
Apr 12 12:07:13 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 1 ****
Apr 12 12:07:23 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 2 ****
Apr 12 12:07:33 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 3 ****
Apr 12 12:07:43 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 4 ****
Apr 12 12:07:53 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 5 ****
Apr 12 12:08:03 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 6 ****
Apr 12 12:08:13 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 7 ****
Apr 12 12:08:23 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 8 ****
Apr 12 12:08:33 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 9 ****
Apr 12 12:08:43 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 10 ****
Apr 12 12:08:53 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 11 ****
Apr 12 12:09:03 iMac kernel[0]: **** [IOBluetoothHCIController][TransferACLPacketToHW] -- commandSleep(&mSystemOnTheWayWakingUp) failed -- counter = 12 ****

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IMac wireless mouse/keyboard unavailable after awakening from sleep - OS X 10.10.3

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