I have a workflow with a State Machine (Nintex WF2013 on premises) which initially behaved as expected, but all of a sudden stopped sending e-mail notifications within the State Machine branches.
The rest of the actions in the state machine continue to work, i.e. any actions defined after sending the notifications are executed. Even the e-mail notification action itself is displayed as "green" in the visual workflow history. I verified that e-mail notifications in other workflows on the same site continue to work as expected.
The list contains only a few dozen items currently and the workflow history list also has only a few dozen entries, so I should be no where near any performance limits.
Deactivating the Nintex feature on the site and immediately re-activating it fixed the problem a few times, but then it randomly stopped working again. Now even this does not solve the issue. I am only a site collection administrator, i.e. cannot reboot any services.
Is there anything I can try to do before taking it to the infrastructure team?
