Happens Daily - This order's address couldn't be verified.

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For the past few months we have been getting false notices that "This order's address couldn't be verified." 

We ship USPS and when checking the address directly with USPS using their https://tools.usps.com/zip-code-lookup.htm?byaddress

the address is always correct. This happens with PO Boxes and Puerto Rico addresses but also happens with other addresses. We call a lot of these customers saying we are having trouble validating your shipping address and 9 out of 10 they say we get shipments to that address all the time, it is correct, so I then go to USPS direct and sure enough the address is perfect. Even copying and pasting from USPS validation back to shopify we still get the same "This order's address couldn't be verified." 

What is going on lately with the address validation feature? Anyone else having this issue?