It is a hardware issue. The dell has the same touchpad manufacturer “LITEON”. Grounding the touchpad by soldering does not help either. I personally faced this issue on the FW13 and FW16. The touchpad tracking starts jumping and skipping after 30 minutes of power on. Turning it off resets it and fixes it temporarly and I also noticed that being barefoot reduces the issue. I think some people notices it less, or some skin type exhibit this issue more.
