shift in printed colors

i have workcenter 7556

using windows 10 /64 and the driver iam using is the last one downloaded by the printer home page 

when i print part of the image is shofted to another place in the same image and this part is of one color i think not the all colors

this problem apears well when i print on both sides of the paper or when i print many pages with no hold time between each other

sometimes when i print only one page and on only one face the image comes fine other times no

this happens with printing full color pages 

i tried to make a software reset , updated the printing drivers but no way 

please advise

thanks