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I have the same exact problem. I have been following this for about 3 months and it appears that it is a stock rom issue. This has occurred on all my mightyrom sprint versions I've tried. But, its not mighty causing the problem. It appears that it is a sprint rom problem. It usually is pretty stable for about a month and then for some unexplainable reason (I can't find a pattern) the phone decides to download all my yahoo email and locks it up. Deleting/resetting up the account helps but that takes a long time too. I guess the only fix is to clean out the yahoo inbox. Yuk!