If you receive this message in the RA console related to your harvester or harvesters it means the harvester is falling behind a little bit in the data and it can usually be safely ignored, and shouldn't impact data if just a small period of time 'before check'.
However if you wish to try and eradicate the message.
First stop/restart the NetQoS services on the harvester/s.
If you still have the message re-occurring after.
Then raise a support ticket and please upload a CIG file collection from the RA console and one of the harvesters to that CA support case/files from customer.
Support Case Information Gather (SupportCIG)
The SupportCIG gathers log files and system information from any NetQoS product, including ReporterAnalyzer. The utility comes in the form of a small executable that typically takes 2-3 minutes to run.
Operates on: Harvester, NFM, RA Console, DSA, RA Standalone