Lenovo X1 Faulty Trackpad?

Hi everyone. I was hoping someone might be able to help me out with a problem that I've been seeing on my Lenovo X1.
From time to time, the pad will stop responding properly. The cursor flashes with the busy icon and my cursor goes wild. It lags behind, it puts the cursor further than where I am directing it to go and it makes clicks that I have not made. If I use the knob and the buttons, it works fine (but that knob is very inconvenient).
I have read that it may be related to a faulty power supply unit, but other than waiting for it to happen again so I can test that theory, does anyone have any ideas what could be causing this?
Thanks!
Edit: Title clarification.

Hi DanJones662
Does the problem occur if the power adapter is disconnected? When it is randomly disconnected, does it produce any Windows hardware disconnect sound or does it still exist in Device Manager?
Try this
1. Try to run System Update and install any Critical / Important tab update.
2. Restart your computer, go into BIOS through F1, restore default settings and exit.
If those steps does not do any help, contact Technical Support. The connection between palmrest and the system board could be loosen.
Happy 2012!
Peter
W520 (4284-A99)
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