i keep a box of first aid alcohol cleaning wipes (the kind nurses use when administering a shot), and a can of air to clean trackballs. if there is no defect in the trackball hardware, this will almost always fix the problem.

if that still doesn't work (i've only come across 2 bolds so far and haven't worked with them much) since it is brand new, i would just return it and get a new one immediately.