(ShareCast News) - NatWest Bank is looking into problems with its online services after customers complained that payments, including salaries, were not going through.Customers said the website was running slowly, while some were unable to use the bank's app or even their credit cards.The bank tweeted: "Reports have just come in and we are aware online banking is running slow at the moment and we are looking into this with a matter of urgency."Last month, technical issues at Royal Bank of Scotland meant that as many as 600,000 payments did not go through.