Why does LiveUpdate consistently fail now after the update to version 21.1.0.18?

Why does LiveUpdate consistently fail now after the update to version 21.1.0.18? It has not worked correctly one time since the update was released! Every time it's the same error 8920,223 and the only fix is to manually download the updated definitions and install them. Since they can be downloaded manually why can't LiveUpdate retrieve them automatically? Has Norton/Symantec become as unreliable as most of other major software companies now? Since it makes no difference what OS the system is running, this is obviously a Norton snafu and has nothing to do with the OS.