Many banks and building societies have sporadic problems with their online services
Online service problems at Nationwide have led to some customers' accounts incorrectly being shown as empty.
The building society said that the issue was temporary and advised customers to use branches and cash machines instead.
Customers have reported problems after checking savings and current accounts. In some cases the account appears not to exist or displays as empty.
Nationwide is the biggest building society in the UK.
It is not alone in reporting problems with online services. Numerous banks and building societies have suffered problems with online services in recent years, many of which are based on old technology.
Social media has been awash with Nationwide customers saying that they have not been able to access accounts online or on the mobile banking app.
A Nationwide spokesman said they should not worry that their money has gone. He said the service would be back soon and other services for customers were unaffected.
Source: BBC News - Business http://www.bbc.co.uk/news/business-24280934#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
