I'm having the same problem and am astonished by the number of others with this issue when I googled it. This is the second time I've had this problem. The first time was 6 months after purchase and it was still under warranty. When I sent it to Sony, they said by the time they received it, it was working properly and they did nothing to fix it. Exactly a year later, it has happened again. The camera hasn't been dropped and is only 1.5 years old. Both times it has happened it's been very cold outside - but other than that, the issue seems completely random. Have you heard of how to fix it? Thanks!