I noticed that both in SMS, and whatsup db, and I also have seen a "conflict" between Accuweather working and sms receiving.. I've seen that when the problem occurs (I've had the problem 3 times and I have always had the need of a reset), accuweather stops updating information.. it seems like the internal memory can't be written anymore.. Moreover.. when the problem of databases (sms and whatsup) occurs, N9 can't be seen as a mass memory connecting it to PC..