I wanted to throw this out there as I haven't been able to come up with an answer in my searches. I just upgraded to Enterprise 11.4 hoping that this issue would have resolved itself. This issue also occurred in Enterprise 11.2.
Fairly regularly when I open Server Manager and select the Statistics tab from the Logs, not all 3 charts are displayed. I use this for a quick review of how things are looking. Sometimes none of them appear or just one or two. When I open the Developer Tools I see lots of errors saying Failed to load resource: net::ERR_INSUFFICIENT_RESOURCES. This is shown int he screenshot. Wondering if anyone else has experienced this.