I am having an issue with my cyan. I replaced the head about a year and a half ago and the damper. I changed the cap tops then and 6 months ago and just put a new one in again and it is still missing nozzles and printing irregular. So our cap top is only lasting about 6 months, is that normal? It usually fixes the issue for a little while but it didn't even last a week an its already missing and printing wrong. Could be a damper again, it appears to look fine. I'm thinking somehow it keeps getting air in the line. Any ideas? Should I replace the damper again?