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Sounds like you most likely got phished. The Trezor will automatically lock after a certain amount of time. There is also a chance a roommate might’ve sneaked in your room before the auto-lock time expired, but he’d still need your pin for transferring funds. Someone having access to your mnemonic + passphrase has full control of the associated balances. You probably typed this in somewhere you shouldn’t. Learn. Adapt. Overcome.