What does it mean if a guy snaps you every 2 hours but then suddenly only snaps once a day?

Basically me and this guy have been snapping for like four months and he would reply every two hours with his full face in frame or his really cute dog. But recently it’s turned to once a day, still full face but he seems sad. Asked what’s wrong and no response. I don’t know what this means, or if me asking was a step too far. Or if I’m over reacting and reading too much into things.

What does it mean if a guy snaps you every 2 hours but then suddenly only snaps once a day?
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