Sounds like the well is being drawn down past either the foot valve, or some other opening in the line.

I had a similar problem with a dug well I use strictly for a source of wash water, not potable, for my shop. It turned out there was a crack in the poly line down the well, if I pumped it for more than a few minutes it would do exactly what you describe. I replaced the line from the elbow at surface, down to the foot valve and the problem dissapeared instantly.

Best of luck.

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