the first problem in a result of a chas card holder was detected on 24 september 2018 by moh. ncs group was informed quickly, which then consider the problem by infrequent network connection problems. between 9 october 2018 and 2 november 2018, another 5 more error cases were detected and leading into a deeper investigation. in november 2018, ncs pte ltd traced the reason of problems to a software version issue used on a server used by the system. the found issue happened during a merging of the system to another government data center in september 2018. the software version issue was resolved to fix an unrelated slow performance issue on 10 october 2018. however, wrong results created between 18 september 2018 and 10 october 2018 stays.