Hi Gang!

In the last 3 weeks or so I had a couple customers complaining that they cannot checkout due to an error stating that the address they have entered via pay pal (their home address) is not a "confirmed" address and asking them to return to pay pal and try again.
The error is not consistent. Most of the orders are going through, but I start getting this more often. Here's an example of the paypal generated log in the payment module (with sensitive info masked out):

Code:
2013-12-03 12:02:07
-------------------
(live transaction) --> https://api-3t.paypal.com/nvp
Request Headers: 
Array
(
    [0] => Content-Type: text/namevalue
    [1] => X-VPS-Timeout: 45
    [2] => X-VPS-VIT-Client-Type: PHP/cURL
    [3] => X-VPS-VIT-Integration-Product: PHP::Zen Cart - WPP-NVP
    [4] => X-VPS-VIT-Integration-Version: 0.1
)


Request Parameters: {GetExpressCheckoutDetails} 
Array
(
    [TOKEN] => XX-XXXXXXXXXXXXXXXXXXX
    [METHOD] => GetExpressCheckoutDetails
    [USER] => sales_api1.mysite.com
    [PWD] => ****************
    [VERSION] => 2.3
    [SIGNATURE] => ****************************************************ydTD
)


Response: 
Array
(
    [TOKEN] => XX-XXXXXXXXXXXXXXXXXXX
    [TIMESTAMP] => 2013-12-03T19:02:07Z
    [CORRELATIONID] => xxxxxxxxxxxxx
    [ACK] => Success
    [VERSION] => 2.3
    [BUILD] => 8620107
    [EMAIL] => [email protected]
    [PAYERID] => XXXXXXXXXXXXXXXX
    [PAYERSTATUS] => verified
    [FIRSTNAME] => John
    [LASTNAME] => Doe
    [COUNTRYCODE] => US
    [SHIPTONAME] => John Doe
    [SHIPTOSTREET] => 123 somestreet
    [SHIPTOCITY] => Some C
    [SHIPTOSTATE] => NY
    [SHIPTOZIP] => 12345
    [SHIPTOCOUNTRYCODE] => US
    [SHIPTOCOUNTRYNAME] => United States
    [ADDRESSSTATUS] => Unconfirmed
    [CURL_ERRORS] =>
Any clues why this can be an issue?
thanks!
gabstero