Hello , We have a problem with a remote poller ,

It happens several times a day that it is down with this error message : 

Database updates not active

We have also this message on central-broker-master.log :

[2022-05-13T07:59:59.516+02:00] [core] [error] failover: global error: BBDO: invalid protocol header, aborting connection: waiting for message of type 'version_response' but nothing received
[2022-05-13T07:59:59.516+02:00] [tcp] [error] Error while reading on socket: Operation aborted.

It’s ok once we restart the services on central.

Has anyone ever had this problem ? Thank for your help.