Hi bctirado
In 9.3 I know of one issue we currently have with gateways in which they cannot re-authenticate with the KNM Service running on KServer after cycling the KNM Server Service.
So, you may see this recur after applying a patch, reapply schema, or kicking the server.
A restart of the Kaseya Network Monitor Gateway service on the respective gateway machines resolves the issue and the gateways check back in successfully after the restart of service in most cases (This might be easier fix then uninstalling/reinstalling every time it occurs if this is what you are seeing).
A fix for this issue is tentatively scheduled for patch 9.3.0.9.