When I have a folder open in the Finder, in list view, and have several of the folders expanded (or as they say, the disclosure triangles expanded), sometimes I come back to the window and find all the triangles have been reset. In other words, various entries will be expanded/drilled-down, and then something happens, and then all of the folders have collapsed again.
This is particularly irritating because I often have a particular folder opened, one which has several levels of nested folders, and when this occurs I have to manually drill down using the disclosure triangles again.
Why is this happening? How can I stop it from happening? I am using Mac OS X 10.6.