Both iPad and iPhone Mail Crash Using Certain Letters in "To" Field

Here is a peculiar mail crashing problem, and it is happening on both an iphone 4s and the newest ipad. Mail works on both, but on both devices when a new message is created and you go to type in the "To" field, clicking first on the letters s, g, j and f makes mail crash. All other letters work fine. If you press "s" twice quickly, both letters show up and don't crash mail, but if you delete the second "s", mail crashes. Again, this is true on both devices. A hard reset was performed on the ipad to no avail. Thinking there might be a bad app, each app was deleted one at a time on the ipad with trying mail after each deletion: no luck. Again on the ipad mail accounts and messages were deleted: no luck. In the end a full reset of the ipad was performed: still no luck.

This all started happening about two weeks ago, right around the time of the 6.1 update. That might be the problem, but others with 6.1 don't seem to have this problem. Seems like both devices would have in common apps, email messages, and os 6.1. Kind of feel like apps and email were checked out fairly thoroughly with no clues. The keys here are that it is happening on both devices, and on both it is the same 4 letters that make mail crash. Would love advice.