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Helpful answers
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Aug 28, 2015 6:32 AM in response to Pia Itteilagby dominic23,Jumpy Trackpad
http://support.apple.com/kb/TS1449
Go step by step and test.
1. Restart
2. Shut down the computer.
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.
3. Is there any Bluetooth device nearby with failing batteries? If so, replace the batteries.
4. Reset PRAM: http://support.apple.com/kb/PH14222
5. Reset SMC. https://support.apple.com/en-us/HT201295
Choose the method for: “On Mac notebooks with non-removable battery”