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Call the plumber who installed it, and take it from there. You may have a recall, reimbursement situation.
I was also told maybe it was mineral deposits. After (a most likely unnecessary) pressure valve replacement --- the problem did not go away.
After I sold the house --- months later --- I read an article about defective components in the water heater itself. I am convinced that was my problem --- but way too late for me. I agree with previous post about a deteriorating component and his comment regarding reimbursement situation was right on with the article I read. Good luck.