GridServer 5.2.1 Hotfix9 has been released. Here are the release notes:
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Affected Components for 5.2.1_hotfix09

The following components are updated by this hotfix:

Drivers-All
Engine Daemon
Java Specific
Tomcat

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Closed Issues in 5.2.1_hotfix09 (This Release)

Drivers-All
GS-17942
When a Broker closes the session after completing client timeout, the Driver does not stop retrying.


Engine Daemon
GS-17874
There is an issue with restarting the Engine because the Brokers do not have enough time to synchronize resources with the Director.


Java Specific
GS-18039
ENgine JRE has been updated to version 1.8.0_361.


Tomcat
GS-18040
Apache Tomcat has been updated to version 8.5.87.

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To download this hotfix, login to the Support Portal and navigate to Downloads > Hotfixes > AvailableDownloads > DataSynapse > GridServer > 5.2.1.