A weekly custom report has gaps in data using 15 minute resolution
open a dos box on the NFA console server :
> mysql reporter
> update parameter_descriptions set DefaultValue = '1200' where Parameter = 'maxRecordsPerInterface';
Then monitor the results. Usually if the parameter maxRecordsPerInterface in reporter.parameter_descriptions is changed to a larger value no gap observed is then in the graph
If you still have issues or are using another version other than 9.3.6 and the workaround does not work, please raise a support case and quote defect reference DE306216.