Just had notice from Anderson Zaks that they have been made aware of a issue which has meant there are, “intermittent declines on MasterCard branded cards.” . Apparently it is now solved but there may have been a period yesterday evening where there were more declines than normal for Mastercard/Maestro cards.
As always the Chart Card Payment Failures Day View report, (under the financial tab), can go someway to giving you an idea as to whether or not you were particularly affected.