I have many robotic tasks, all of them runs when triggered either from process or by Re-execution or By TEST button, but one of the Robotic tasks which was executing previously has stopped triggering from process model, in the process model gets stuck at the robotic tasks node without any errors and fails with timeout after long time. Re-execution of the previous instances is also not triggering any new instance for these robotic tasks alone.
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Your issue is most likely a stuck/queued robotic task or no available robot, so the process stays active and times out after 96 hours.https://docs.appian.com/suite/help/26.3/Execute_Robotic_Task.html#runtime-behaviorAlso, Verify the concurrent execution limit setting on that robotic task - if it's set to 1 and a previous instance is stuck In Progress, new ones queue indefinitely, which matches your exact symptoms (no error, just hangs then times out).https://docs.appian.com/suite/help/26.3/rpa-9.22/configure-run-time-settings-tab.html
https://docs.appian.com/suite/help/26.3/rpa-9.22/robotic-task-execution.html