Does anyone here have any guess why blocks of nozzles are dropping out of the yellow channel of a new printhead? I tried a new head cable and it made no difference. The damper is half full. I do not think the problem is ink starvation. The nozzle check looks the same anywhere on the media. I have wiped the encoder strip with alcohol. The encoder strip does seem loose to me, but I don't have anything else to compare it to. Cable? Carriage board? Any suggestions?