CJV30-130 Test Print Issues.

Hi guys, got a CJV30-130 here owned for almost 2 years. recently i've been having magenta issues, i will get around to upload a photo of a test print but the crux of it seems to be each time i run a test print the actual missing lines change almost each time i run it. i'm thinking it possibly is something other than some clogged nozzles as they'd been consistent if that's the case?.

Ran a few good cleans including an overnighter nozzle wash but can't seem to point this one out, it's had a new damper on the left side magenta in it's last service and also the capping station has been replaced any other ideas?

thanks!