Has anyone else had trouble with the KX2 (KOI) unexpectedly losing voice tags? I often try to call someone using voice recognition, only to find that the phone no longer recognizes his name. I check the voice dial list, and find that they are no longer on it! It lets you re-enter the voice tag, as if it never existed for that person, but a few days later, it or someone else's is gone! Frustrating.