Why is Pex starting to get Pinhole leaks like copper?

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Over the last year been cutting out more and more Pex A uponor pinhole leaks and its worrying me because Ive installed miles and miles of that pipe in peoples homes over the years, I have recently switched over to Zurn Pex B I think its a better quality pipe and it uses the same expansion fittings and rings as uponor, Im able to use my same equipment to expand the Pex B Zurn pipe as I do for Uponor and Zurn actually redesigned the expander heads. I Like Zurns expander heads way more than uponors it seems to make a better fitting and expand the pipe in a better way. I also like the Zurn is made here in America, I also like that Zurn prints the born on date directly onto the pipe its not a code you have to go look up like Uponors.