Hey there, Hello? Yes, you, crouching in the cardboard box, we can ALL see you, you might want to read this.
The official Konami Twitter account has tweeted the following:
[Important] Do not use Quiet while playing Mission 29 or 42, it may corrupt your save file!
Please RT to spread the word!
There is no talk about a fix yet, but as soon as we hear anything we’ll let you know.