Sample Uidemo gets stuck after a while

I have followed an example on YouTube, to create a sample Re Framework application, using Orchestrator Queues:

It somehow worked, except I had to define the variables LoggedInSuccessfully, Username, Password

When I run the project, using the debugger from inside Studio, it creates the expected number of records inside the queue (Dispatcher part), then starts fetching them and entering them in Uidemo (Performer part).

During the Performer part, after a variable number of successful transactions (for instance, after 12, or after 19), it gets a timeout during “set transaction status” and then it stays stuck forever.

I also tried to delete and re-create the Orchestrator Queue, but it didn’t help.
This is the full code. What am I doing wrong? (617.0 KB)