HP OfficeJet Pro 6978 . colors dropping outeven though indicator show 1/3 full

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I bought an HP OfficeJet Pro 6978 in May. I replaced the color cartridges a few weeks ago. After printing about 30 pages, the yellow dropped out even though the indicator shows 1/3 full. On the next page, the cyan dropped out even thought the indicator shows 1/2 full. Something is very wrong. This was over a few weeks. Then when I tried to print a couple of pages, this happened. The expiration date are in 2019. I have another set of color cartridge but they are very expensive and I don’t want to waste them when the printer is apparently malfunctioning

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