I have the same issue - see the attached post which acknowledges a problem https://www.paypal-community.com/t5/REST-APIs/Failed-transactions-using-PayPal-Payments-API/m-p/3033825#M8130 - my ticket to support was submitted 5 days ago and still shows as 'further review required' - such bad service from paypal, I've had to sign up to a new payment gateway to facilitate a short-term solution.
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see this thread https://www.paypal-community.com/t5/REST-APIs/Failed-transactions-using-PayPal-Payments-API/td-p/3033825 I've had this problem for over a week not and still no reply to my ticket other than an email of acknowledgement - status shows as "Further Review Required" . After days of missed out sales, I've had to sign up to a new processing gateway to avoid further lost sales, not good enough from Paypal.
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We are experiencing the exact same problem - reported to Paypal 2 days ago and still awaiting a reply with us missing out on daily sales ... now looking at alternative card processing companies given the lack of a response to the problem as I am still awaiting a reply from Paypal.
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