Hi Bobbi
It sounds like any of the following
- loose tolerances or ware on the plastic guides holding it in place
- loose release button
- something it runs over pulls on the dust box, and removes it
Check if the fit of the dust box has become looser over time, and if there is a part of the floor that's unlevel and could catch the box, disconnecting it.
If so, consider using a small layer of tape to add some thickness to the mounting points to better hold it in place
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