Twice today I have had it where my A1 would not turn on and was just completely dead. Both times after leaving it turned on it came back to life approximately 5 minutes later. I have to be honest and say that I am not very happy as my camera's behaviour is now worse than when I sent it in to Sony. This is clearly an intermittent issue, however it was slightly predictable before in that it would only do this on occasion when changing the battery (but not every time), or after using the wi-fi, both of which I could control so that it would not affect me whilst on a shoot. Now it just happens intermittently when I turn on the camera
It's going back to Sony again, I just hope I get it back by the 5th October as I have a portrait lighting tuition booked, and on the 6th a wildlife experience hopefully shooting foxes and badgers.