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1. Scan for malware https://www.malwarebytes.com/
2. Deauthorize all other devices https://store.steampowered.com/twofactor/manage
3. Change passwords from a clean computer
4. Generate new backup codes for your Mobile App https://store.steampowered.com/twofactor/manage
5. Revoke the API key https://steamcommunity.com/dev/apikey
It should never change without you going in, and if it is then you probably already did give your account info away somehow and don't realize it. Steam Guard won't protect against that.
Oh you can also check here to see if there are any logins outside of your area.
https://help.steampowered.com/en/accountdata/SteamLoginHistory
I would do the steps in posted for peace of mind and then create a new key. Just keep monitoring it going forward.