Pain the the rump, again, and again, and...
Periodically, I try to check my Yahoo email, and get a message telling me that my password or log in isn't correct, perhaps the day after going in and out of the account several times successfully. I try and I get a message telling me I have reached the limit for attempts. Then I go through the dance of creating a new password (I just use the old one) and volia, I am in.
Seriously folks? This is both a pain and bush league and happens a couple of times a week, to both me and my wife, and has been going on for months.