Please download and rebuild with the latest QuickOPC 2019.1, build 422.1 or later, as on our Web page and NuGet.
Setting ServerStatusCheckPeriod to -1 should now disable the server status checking in OPC XML-DA.
OPC Server status verification is still triggered even if it is disabled: ClientParameters.ServerStatusCheckPeriod = -1.
In my case I need to disable server state verification or get control over answer handling.