My friend, partner and myself have all had to reset passwords on iforgot.apple.com in the last 2weeks.
None of us have had any security related problems or even left our phone lying around for someone to get at.
I did however notice it forced a set of T&C's down our throats I wonder if these are a new set of T&C's but still why the password change?
For what I can tell, those who have had password issues were those who had used simple passwords... (no numbers or capital letters). Apple now requires passwords to be more unique with numbers and capital letters. I believe this is causing a lot of problems for those who used simple passwords before this new requirement. I know of 3 other people who used simple passwords and they are all having password issues. My sister and brother in-law both have more complicated passwords and they haven't noticed any password related issues.
You might want to set up a new iTunes account.