It’s most likely a driver problem in that the touch screen interface and touchpad are interfering with each other; however this should have been sorted by Dell before despatch, so send it back for a replacement. (Perhaps choosing a slightly different model)
In the meantime try turning off the interface you are not using, to see if this improves it.
Hope this helps
Bill
If its a driver issue, then it should classwide, and then Dell would probably allready have a default fix for it.... The model is not entirely new but sold for a few months now...