Hp 5500 yellow printhead problems

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This problem start with my black print head would not print. We prime the system and black would work then stop. We replace the ink tube assy. and the printer work about 1 month. The yellow ph stop working and we place it. The new yellow start to leak. It looks like very small air bubbles in the bottom of the ph. We replace it again and start to work for about a month. The same problem again. I check the yellow ink line and I can see a air bubbles. Prime the system with setup heads. Could it be just bad print head from Hp?

 

[Lincan]

do you use original ink?

I suspect the problem is in your ink cartridge, try to replace them, and if you use non HP ink, the problem is the refill procedure.