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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! I suspect the issue lies with the water heating. I know you stated it was getting hot but is it getting up to temperature fast enough? Did it slow down all at once or has it gradually gotten worse?
Is it an instant hot water tank that heats only on demand? It may be that the water coming in is not heating up enough and requires more time from the internal heater.
There is a sensor that is used to make sure the water is hot enough to sterilize the dishes.
May I please have your model number so I am able to provide you with accurate, model specific information?