Once the private key is in your hands you're responsible for the funds. Truly speaking someone might have known about your private keys and passwords. Myself too have experienced loss of funds from my blockchain wallet which happened due to my negligence of keeping private keys securely.
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If you carefully read my post, I always double-check and secure it, no one has access to my private keys or passwords. This is the case of the blockchain wallet security, please take some time to read similar posts, it happens these days on a regular basis.