Magic Mouse drops connection with two blinks; unable to reconnect

My magic mouse drops connection frequently. It may drop connection at any time with no reason and goes off into two blinks. Then it's unable to be reconnected. I've tried many things, including turning the mouse off and on, turning Bluetooth off and on, unpairing the mouse and try to repair (unable to discover at this moment), but nothing works. After waiting for a long time it may get connected suddenly.
I believe it is the computer's issue rather than the mouse. I have two Macs (MacBook Pro and iMac) and two Magic Mice, but the issue only happen to my MacBook Pro with either of the two mice.
Any suggestion would be appreciated. Thank you!

I really cannot see why those problems relate to only one of your machines though you don't say if you have reset the SMC on the MacBook Pro.  See ...
http://support.apple.com/en-us/HT201295
Nor do you say if you have given the batteries a thorough check.  While this should not affect only one machine, Try removing them, clean the inside of the compartment and the battery terminals themselves.  If it is reasonably possible, replace the old batteries with new ones.

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