@Fekke UiRobot is the application in charge of executing workflows created with UiPath Studio. UiPath Studio communicates with UiRobot through a WCF service that is hosted by default on named pipes.
By default, the maxReceivedMessageSize of the named pipes binding is 65,536.
When you debug a workflow, the values of all available variables and arguments are also sent. This may increase the size of the message and make the communication channel faulted. When this happens, studio may no longer be able to communicate with the robot. I guess this might be the reason you are receiving the communication object faulted exception.
Can you try increasing this value, in UiRobot.exe.config for both DefaultDuplexEndpoint and ExecutorEndpoint and let us know if you see any change?
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