Digital BW, The Print

The last two weeks I've seen banding on prints (both color & B&W) made on my
R800. I have no idea why or whether there is a solution to it. I've had the
printer for about two years and used it extensively so I suppose it could
just be wear. If there is a fix I'd love to hear about it. Would QTR be
likely to help? 

In the long run (next few months) I hope to buy a K3 ink printer, but I'd
love to keep this one for glossy printing.  

Thanks,

--Gib