Group object log viewer shows gaps in graph when viewing ExtendedLog data.
The Group Graph Logviewer can support up to 20000 data values being plotted at the same time, anything beyond this you will receive dropped blocks of data.
This was increased to 40500 in Continuum v1.94. If you are plotting more than 40500 total data points then you may see this problem where some data is dropped. Unfortunately this is a limitation of the Logviewer control and it cannot be increased beyond this.
Reduce the number of data points being plotted by reducing the time being viewed or the number of objects being plotted on the same graph.
Using the Report object to graph this data may be another alternative.