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.
If you carefully read my post, I always double-check and secure it, no one have 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.
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I'm not talking in favour of blockchain.com, but however we cross check there are possible chances to miss the private keys and passwords. For me it happened in 2016, further I was very careful in handling my private keys and paawords. Till date haven't encountered any problems. You can trace the last transaction from your wallet and the corresponding ip, which might make it clear whether it has happened from your location.