Someone else mentioned predators. There are bobcats in the area, but haven't seen tracks near the house. They did start hitting the feeder after I switched them. Thinking it was more likely the spoilage in this case.
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All possible. It could even be something we don't think of. Like, say, air currents, nearby objects, etc.
I had plans to put up something more sophisticated in the backyard to photograph birds but with our four cats, I don't want to do that to the wild birds :)