@Stevenson, Blake (CBCCA)
Based on the above description, it is difficult for us to determine the specific cause.
Agree with what RahulJindal said, we may get more detailed message about the process of downloading software updates by checking PatchDownloader.log. This log will be generated when SCCM downloads the patch.
If the response is helpful, please click "Accept Answer"and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.