Stream gives error message when I try to download recordings to my phone

When using Stream to download recordings to my phone, sometimes it works. At other times, it stops saying it has encountered an error and to try again later. When I try again, it stops earlier in the process and gives the same message. This has happened three times on different episodes of the same program on two different days. Two other programs downloaded correctly. A third did not even attempt to download; it just said it could not be downloaded. I have closed the app and restarted my iPhone twice. How do I get the download function to work properly?