Of course it's possible (if it was your fault). Just like it's possible to lose all the money from your PayPal account if you give them your password. Your coins won't go missing without any reason.

In this case, it's almost certain that it was OP's fault. That's not the first time I see someone losing their coins just to eventually be revealed that the OP had a malware, entered his password into a phishing site or something like that. So I wouldn't be surprised if that was the case.

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Edit: Looks like it was something with Blockchain (I guess...?). Only now I saw that OP edited the post and wrote the last part.

But I still wanted to know more about this. Haven't read anywhere else about any recent Blockchain.info "bug".