I don't know how far "Failed to Download Image" is in the operational sequence of a cable-box. Perhaps its a specific frequency on the network affecting downloads.
Is the cable-box connected to a coaxial-cable splitter? If so, could you directly connect the cable-box to the coaxial wall-outlet? If your Internet modem is also on this potential splitter, you'll lose Internet service until your reconnect its splitter.
Is your Internet modem in the same room? Is it connected to the same coaxial wall-outlet? Do you have multiple cable-boxes in your house? If so, could you swap one of the other cable-boxes with the problematic one?