VISA Outage in Singapore?

I was trying to pay my grocery at ColdStorage last night by VISA but the processsing took longer than usual. It eventually failed and so I paid via NETS. Later that evening, I tried to pay by VISA again in Sheng Shiong and the transaction failed again. Just the same, I paid via NETS. That was strange because I don’t have outstanding balance on that card. It can’t be chip problem because I use the PayWave in Sheng Shiong.