My Inspiron N5030 is about 3 weeks old

Today while working on a spreadsheet, the cursor simply froze. Nothing would move it.. I tried rebooting  - twice. No joy.

The cursor does work normally when I connect a mouse, however, so I infer a problem with the touchpad.

It has worked fine up to now - apart from an occasional episode of "getting drunk", as noted by other users - when the cursor does such odd things as refusing to "go all the way", as if it has run into an invisible barrier.

Any suggestions?