BIG IQ Unable to post data from device

Hi Team,

anyone got this kind of error in restjavad.0.log?

[INFO][06 Aug 2021 16:09:43 BRT][/cm/shared/stats-mgmt/stats-node-task/.../worker StatsNodeTaskWorker] Unable to post data from device 192.168.100.11 to the agent manager (server busy), will retry after at least 10 secs

After these logs, all dashboards stops to shown graphs. :(

Any idea how to fix this?