I have had my a7mkii for 18 months. It is my back up camera and has hardly been used. It has never been knocked,dropped or been in contact with water or humidity. On a couple of occasions since purchase the camera on start up has come up with the message camera error switch off and restart. This has worked but now I get the message every time. Switching off does enable the camera but this can happen if I just press menu or any other button. Sony say it is not a known fault though the internet is stacked with similar stories. Any advice much appreciated.