Roku Top Level Search Results No Longer listing Channel's content/videos

Until just recently, when searching for a particular term ("Stadium Swim", for example), Roku's top-level search would list any video within our channel that included the search term in the title.  Now, the search ONLY shows the top-level channel, if one exists.

We're seeing this behavior on a number of the channels we've developed.  

Any ideas on the cause and how to correct it to return content from within a channel?

Thanks,