Hard to say without laying eyes on it. No triggers, something disconnected it, electronic malfunction. If you don't need the pics on the card as hi res, maybe try formatting and erasing the card on the app or web.
Tell us what you've tried to correct it and have ruled out. Hopefully we can help narrow it down.
A couple common issues are:
You may have a disconnected USB. Unfortunately, the only way to check that is to go to the unit.
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