Users are reporting a serious PlayStation 4 glitch corrupting save files.
According to a lengthy thread on the official forum, the glitch, with error code CE-34878-0, loses progress and can make games unplayable by causing them to crash.
Originally found with FIFA 14, which becomes unplayable, it's also been seen in other games including Battlefield 4, Call of Duty: Ghosts and NBA 2K14.
"I've even done a full restore to factory settings and it made no difference at all," said user aaronmcadam in late December.
The problem has persisted and at the time of writing, Sony has not responded with the cause or fix.