Score Drop - Could someone please help me figure out why?

[Ineedaname]

A couple of things have recently happened on my credit report.

1.  I paid down 3 of my 4 credit cards to a very low balance (under $100 each)

2.  My mortgage was sold to another company and has reported as closed/in good standing

My credit score dropped by 28 points?  Why would that happen?

[Anonymous]

For some reason when an account is paid off and closed it seems to ding the credit score. It should recover quickly however. 

[dursty87]

The closing of an installment loan has been known to ding your score.

[Ineedaname]

Thanks for replies - I'll keep an eye out for an improvement.  I can't believe how much it dropped though - crazy!!