The banking sector is "investing heavily" in digital platforms, according to the body which represents the country's lenders as many face a backlash over the latest payday glitch chaos to hit customers. Millions were exposed on Friday to varying challenges from slow app or online banking performance to being blocked out of their accounts altogether. Users said the brands that had encountered issues – which did not appear to be related – included Lloyds, Halifax, Nationwide, TSB, Bank of Scotland and First Direct. Money latest: How is my bank affected by banking glitch? It marked the second month in a…