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Helpful answers
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Apr 13, 2014 1:30 PM in response to F.altesby dominic23,Jumpy Trackpad
http://support.apple.com/kb/TS1449
Go step by step and test.
1. Restart
2. Clean the trackpad with moist not wet microfiber cloth.
System Preferences > Point & Click
Try turning off three finger dragging and then turning it on after testing.
Is there any Bluetooth device nearby with failing batteries?
3. Reset PRAM: http://support.apple.com/kb/ph14222
4. Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If this does not solve the problem, you may have to take the computer to the Apple storeto have it checked out.
Best.