This issue seems to be the connection issue between the API and RCC server. I suggest you contact the RCC support team via the https://my.refinitiv.com/ website to help you verify the disconnection. You may need to give them a specific date and time that the issue occurred.
You can submit a ticket to the RCC support team via the https://my.refinitiv.com/content/mytr/en/helpandsupport.html link and choose the "Refinitiv Contribution Channel" product.
If you want to verify on the API side, the EMA log/trace file is mandatory. You can enable the EMA C++ log file via the EmaConfig.xml configuration file. Please see more detail on the "EMA C++ Logging" and "XML Trace" sections of the Enterprise Message API (EMA) - Configuration Overview article.
Could you please give us more detail about the application and the issue?
I am using EMA C++. This occurred when I was testing and it eventually went away. I was not sure if I was doing something wrong or not. I was looking for a reason why I would get such an error, in general, and not for just this one specific instance.