Unusual Activity, can mean a lot of different things. Some things can trigger an alert at Yahoo that causes them to think your account may have been compromised. This could happen if you are sending out huge amounts of mail--video--pictures, etc., that exceed the normal usage of your account ( or bandwidth)----thereby appearing "unusual".
OR, If you (or someone else) has consistantly abused the sending limit, indicating Spam (or spambot) It could also indicate that someone has been trying to guess your password. After numerous incorrect attempts, Yahoo gets an alert and suspends the account to put a stop to the hacking attempt. There are others---to be sure--- However, it would be nice if Yahoo would identify the "activity", that causes the suspension.
If it's been longer than the 48 hours----then you definitely should contact Yahoo. Try this for Customer Service. 866-924-6676.
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