I've got a Bluetooth Magic Mouse and use it witha retina 15in MBP. Like many, many people I get the disconnection thing happening around twice an hour. I've tried all the fixes -- everything from tin foil in the battery compartment, to PM reset etc. New batteries. Strong batteries. Nothing's fixed it. So, what's the current state of wisdom on this? Is there a fix? From looking at the signal level (hold down Option and click the bluetooth icon on the menu bar) that the signal fluctuates between -50 -60 dBm, which it seems isn't strong enough. The wireless Apple Keyboard I have seems to have a steady -47 dBm and has never disconnected.