image disappears every night

My Omeka site (hosted at is set up to load a Simple Page as a homepage. In it, I have a banner image. Every day I put the image into a simple page with the HTML. It shows up fine all day.

But the next day, it's gone. There's a box with a question mark inside it:

The image is still available in OMEKA, but it won't load correctly in the simple page.

Is the image too big? Why does it show up temporarily and then disappear?

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