Recently I acquired a SprintScan 45 ultra and am having trouble scanning colour negatives. It produces banding, both horizontally and vertically. Transparencies scan better but the artefacts are still there, just less obvious. Unfortunately I rarely scan transparencies.

Does anyone have any ideas what may be wrong with the unit? Here is a sample scan from a 5x4 colour neg:



Thankfully it was bought at a very low price. If possible I will be returning it but just thought I'd see if anyone has any ideas. Software is PolaColour Insight (but same results with VueScan) on Windows Vista.

Thoughts appreciated.