Recently, I was browsing through my Google+ photos on my Android phone and I noticed that many of them appear to have been corrupted. They are covered in varying patterns of colored bars. I've noticed that the exact same pictures are also corrupt on the web interface of Google+, and when downloading photos on desktop and mobile. Disturbingly, the corruption appears to be retroactive - photos going back to 2012 are now corrupt. All photos appeared to upload correctly originally, but then the corruption happened sometime in early 2014.
My phone is a Verizon Galaxy SIII, stock Android 4.3, using auto backup with Google+. I've attached a screenshot of the Google+ web interface showing some of the corrupted photos.
Is there any way to recover affected photos and to prevent this issue from recurring?