"When subitem created" trigger not firing

I just wondered if anyone had encountered issues with the “When subitem created” trigger for initiating workflows? I have an existing (very key) workflow driven off this trigger which has inexplicably stopped working (Run History shows it was working successfully until some point yesterday).

I’ve rebuilt the workflow, I’ve built a super-simple workflow with the same trigger - nothing. Run History shows no indication that any new subitem has been created, ie the workflow doesn’t trigger at all, not that it has failed at some point further through the flow. So is definitely the trigger.

Is there anything that can suddenly cause a trigger or workflow to stop working? I seem to recall there being a limit on workflows per account - if that is reached would it simply pick arbitrary workflows to block? As that’s the only thing I can think of - other flows continue to work as they should.

Any help, thoughts, suggestions most welcome!

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