Mutoh 1624x print fades

Hello! I am printing with a Mutoh 1624x. While printing anything over 2-3ft I notice that the print color kind of washes out. For example I’ll start printing a nice yellow and once the print gets about 2-3ft long it starts printing like a pastel color yellow. It’s not instant, it a very gradual fade. I am printing with Solaris ink, I have been since the printer was new. Never had this issue before. Any help would be greatly appreciated!

 

Good evening! Just changed the dampeners, Charged the ink, and replaced the maintenance station and we are still having the same issues. Any other advice would be greatly appricieated!

 

So, we are running Solaris 440ml inks. We've changed all the dampeners. We are getting good nozzle checks on every color besides yellow. We just ran cleaner cartridges through the printer and noticed that the yellow sub tank never deflated like the rest when we charged the inks. The yellow sub tank always stayed filled with ink