I have several times experienced that the mousepad stops working, or the buttons becom unresponsive or the mouse starts moving by itself.
I can connect a mouse, but it doesn't solve the problem of the cursor moving by itself.
It seems to happen when the laptop has been on for a long time specially if I have been very active on the pad.
It is very annoying for example while working on a large project, where the text become rubbish because im suddenly writing in another line, or activating the wrong button because the pointer jumps 1-2 cm on the screen between thought and click.
I bought the computer for my bachelor education 10 months ago and it has been used for office-like work 97%
Rebooting doesn't seem to help, but leaving it off until cold usually makes the pad work again.
I think it relates to temperature or something, though it is far from overheating. Rather some kind of temperature effect that the pad is affected by.