Bug - SCCM 2012 SP2 CU3 - Software Updates are all set to a 10 minute timeout.
All software updates are set to 10 minutes, and newer SCCM will set the new cumulative updates to 30 minutes. But SCCM 2012 leaves this setting at 10 minutes. Some updates are already 1gb+ in size, therefore are timing out when deployed.
Welp ... someone's gotta say it: this is fixed in the latest release.