Are you using the wait and resume activity then? Not for the wait for validation activity?
The activity that would just wait, for say 10 minutes or whatever time span you indicate was broken and wouldn’t resume automatically. I got it fixed by UiPath a few weeks back, its possible they break these things again though so always worth seeing if there is a bug 
If you are using the activity that waits for a document validation there is an action/task that must be completed before it resumes. Every job should show what its waiting for.
If you can’t see any triggers something really weird is happening…
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