Ulster Bank is insisting customers won't be left out of pocket
Ulster Bank customers are reporting their cards have been declined, while some say their lodgments are not showing up.
The issues began last Friday, when transactions disappeared from some customers' accounts.
The bank says that up to €500 worth of emergency cash is available via branches and telephone, adding that not all customers are affected by the issue.
It also insisted that no customers will be left out of pocket.
Meanwhile, anyone experiencing issues is being asked to contact the bank's customer service team online or on 1850-424-365.