Iphone intermittently says "The username or password for yahoo mail is incorrect"

This is a mystery.  Four email accounts on my iphone 4.   No problems until a couple of days ago, when all of a sudden I get an error message when sending/receiving email BUT NOT EVERY TIME I AM SENDING OR RECEIVING.  Nothing changed about the email accounts.  Nothing downloaded/upgraded to the software for the iphone.  I seem to get most of my email on my phone, but occasionally some mail seems to not arrive, while arriving on my PC. 
??????  Since setting up these email accounts on my iphone (September 2010) I have not tinkered with the userID/passwords, or anything else about the accounts...
Any ideas?

I get that occasionally, usually in a weak signal area - I aways assumed that the attempt timed out and the error message was erroneous.  Usually, a few minutes later it seems to work ok for me. 

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