Very unlikely, I would have thought to be a processor, video card or other hardware issue. Most likely software issue or conflict.
First thing in these situations is to download the update locally, disable all startup programs inc Antivirus and 3rd party services. Disconnect from the Internet, restart and run the update from the download.
Usually works 95% of the time.
Are these 4, all your PC's? If so, what software/services are running that is common on all machines?