I fixed my phantom cursor for a short while by reseting my PRAM but now it's erratic again.

My cursor was erratic and I couldn't control it.  I reseted the pram and it started to work but only for a short while.  After an hour or so it started to act erratic again.  What can I do?

Linc, a pretty credible user who helped me out before, posted this on another thread I having going about this same problem.  None of these things worked for me, but they might work for some of you. 
There are several possible causes for this issue. Take each of the following steps until it's resolved.
1. Follow the instructions in this support article.
2. Boot in safe mode and test, preferably without launching any third-party applications. If you don't have the problem in safe mode, but it comes back when you reboot as usual, stop here and post your results. If you can't boot in safe mode, do the same. If you booted in safe mode and there was no change, go on to the next step.
3. Reset the System Management Controller.
4. If you're using a Bluetooth trackpad, investigate potential sources of interference, including USB 3 devices.
5. A swollen battery in a MacBook Pro or Air can impinge on the trackpad from below and cause erratic behavior. If you have trouble clicking the trackpad, this is likely the reason. The battery must be replaced.
6. There's a report that a (possibly defective) Thunderbolt Ethernet adapter can cause the built in trackpad of a MacBook to  behave erratically. If you're using such an adapter, disconnect it and test.
7. There's also a report of erratic cursor movements caused by an external display that was connected but not turned on.
8. If none of the above applies, or if you have another reason to think your computer is being remotely controlled, remove it from the network by turning off Wi-Fi (or your Wi-Fi access point), disconnecting from a Bluetooth network link, and unplugging the Ethernet cable or USB modem, whichever is applicable. If the cursor movements stop at once, you should suspect an intrusion.
9. Make a "Genius" appointment at an Apple Store to have the machine tested.

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