Navien NPE 240a NG pipes vibrating

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Vancouver bc
Navien is about 8-9 years old and never had any problems until the last year .

When we use the hot water the pex will vibrate like crazy for 5-20 seconds. Cold water is fine. Sounds as if the flows restricted on the incoming line? I will double check the main shit off is all the way open tomorrow.

Anything else I can check? Something inside the navien that can cause this vibrations?
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