How can find out if someone using your yahoo ID and email or password?

I recently noticed some weired activity on my yahoo account , some email that i've never send them to the sender or questions that i've never asked in yahoo and more. i taught somebody hacked my ID and got my password but after changing my password few times i still see these strange things again, so what... show more I recently noticed some weired activity on my yahoo account , some email that i've never send them to the sender or questions that i've never asked in yahoo and more. i taught somebody hacked my ID and got my password but after changing my password few times i still see these strange things again, so what should i do? Any Idea?
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