Any updates on this?
Yesterday we successfully downloaded a small area of a map (feature layer has subtypes and multiple date fields) and it worked so though things had been resolved. Unfortunately, as soon as we try and download a larger area we get the same error messages as last week.
Have 3 maps using this layer - 1 uses an editable view of the layer, and has spatial restrictions to a relatively small geographic area. It will download. The 2 maps that source the original hosted layer will not download at all for some users and only for very small areas (2 city blocks) for others.