Sony has identified what was causing the issue, and is now working on a fix.
VideoGamer.com contacted Sony, to which they replied:
“We have identified the issue related to the PlayStation 3 software update (version 4.45) that impacted a small number of PS3 systems earlier this week. A new PS3 system software update is planned to be released on June 27 that resolves the issue.
“Thank you for your patience and understanding and we apologize for the inconvenience.”
The internet went crazy after this has happened, bricking, or even just general annoyances. They have pulled the update for now, and a fix is coming on Thursday, 27th.
Just to be sure though, just before you update leave it a few days to see what the internet says, and be certain that if it causes a problem it will be on here straight away!
PS3 Firmware Update 4.45 was designed to improve system stability, and it did. You can’t get more stable than a bricked console!
— CEO Kaz Hirai (@KazHiraiCEO) June 21, 2013
Thanks for the info, VideoGamer!