Yesterday we print all day with our epson 4900 , end of the day i do a nozzlecheck i see i missing like 6 lines from VM channel, i run a power clean, and was more terrible , today i started with normal cleaning cycle, and i see on vivid magenta i dont have any lines.. i know 100% its not clogged , where can i look for problem? dampers ? because another nozzles are 100% perfect