My magic mouse is now jumping around every time I pick it up / put it down. It started in the last few days. Any ideas?

Question

Hi all -
I looked around the forums and couldn't find an existing solution...
This afternoon, I started using my Magic Mouse again, after about a week without turning it on. The mouse now jumps around erratically and sends spurious click commands - menus pop up all over the place, links are clicked, apps opened, etc. Usually it takes the form of the mouse jumping 1-8" to the left, and it seems proportional to the impact - if I put it down normally, it jumps about 4" to the left. If I put it down a little harder then normal, it usually jumps to the upper left corner.
This ONLY seems to happen when I pick up the mouse to reposition it on the mouse pad. If I slide it smoothly along the pad, then there don't seem to be any issues.
It has been in my backpack, and was turned on (I realized this afternoon when I took it out), so I wondered if it might have been the batteries. I checked them, and they're fine. It also had trouble connecting, though, and I had to cycle both the mouse and BlueTooth on the MBP.
I also saw several posts here that said it might be the optics, so I tried blowing those out, but they look crystal clear.
Just to be safe, I also updated the Wacom tablet drivers to the latest, no luck.
MBP (July 2011) 15" i7, upgraded to 8 G RAM
Lion 10.7.4
Magic Mouse
Wacom Intuos 5 tablet
no external monitors
It's possible this started when I installed the Wacom drivers, since it 'feels' kinda like using a tablet in absolute mode, rather than mouse mode - but with the mouse hardware. I have not tried swapping out the mouse for another one, nor tried this mouse with another Mac. I can try those in the next few days when I get an opportunity, but figured I'd ask in the meantime.
I'm suspicious of either the Wacom tablet (but I can't imagine there would be a problem, as SO many people would have experienced it already).
I'm also suspicious that maybe something has been jiggled loose inside the mouse, but have no idea how to tell.
Can anyone save me a trip to the (distant) genius bar?
Thanks!
Aaron

Answer 1

hey try a smc reset
EDIT (smc reset
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer. 
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.)
if that doesnt help look at replacing the batteries in your magic mouse and try it then
if the issue still presists take it into a apple store and they can test it there to see whats up