That means that the Agent machines have a full Disk. CSP, by default, will stop logging events when the disk gets to 95% full.
Log onto the asset, and check the disk space.
If you think CSP is the culprit (too many log files filling up the drive), it may be that you have enabled Trivial Logging, or the Common Config is not set for "Delete Logs Files After Processing"
If you don't see a ton of log files in the agent directory (under \scsplog or \scsplog\archive), then it is probably not CSP causing the disk usage issue, but something else.