My 4 year old TZ30 had the same problem, I complained to Panasonic, they offered to inspect the camera and now it has been fixed and will be posted back to me tomorrow. I paid for labour only, panasonic supplied the part, total cost to me is $88 au. I believe Panasonic should have fixed it at no charge as there are many similar cameras with the same problem. (Not fit for purpose)
unhappy camera user, November 2016