Digital BW, The Print

I recently had some scans of 4x5 b&w negs made on a scitx eversmart flat bed scanner.
When i printed the image, there was slight banding only in smooth sky areas, about zone 3, not in the entire sky.
After good nozzle checks, and a cleaning, I re examined the image on the monitor, and I was shocked to see the banding on the monitor.  So it is a scan problem, rather than a print problem.
Has anyone experienced this?  Many scans were made from 4x5 b&w negs, and the slight banding only appears in certain density areas in the smooth cloudy skys.  There is no banding on 90% of the scans.
Any suggestions.
I'm printing on a 7600 UC ink, IP 5.5 sommerset velvet.

Thanks
David Aschkenas