You never tell us anything about your issues.
What is your experience with digital printing? Is this your first printer and you bought it used with no training?
You have to tell us systematically about all your steps before, up to, and after your issue. Pictures are really important.
But with the number of problems you have been having, I would suspect many of them are of your own doing.
Get a Roland tech in, but watch out they don't just start replacing parts that might not need replacing. Get references
from the company so you can call sign businesses that they currently service to see if the guy they are sending is good or
not. Find out the guy, because in a company they can vary in their abilities and professionalism.
Good luck.