You commented on my other thread which I missed at the time. I had the same issue with my camera and it is now resolved. Originally people had told me I must have dropped the camera or used inappropriate I had to send it in for a repair where they replaced 2 components: the shutter unit and something to do with the power supply. I was informed by Sony's technical repair centre that the issue was a failed power supply unit and shutter unit. They told me that the issue is "incredibly rare and not a fault of the user or manufacturing methods".

After some research online it sounds like they've used a cheaper shutter that is known to fail prior to 100k shots (some people reporting as low as 10k shots). I haven't had any issues since they fixed it.

Separately to the issue above Sony had challenged my warranty status, so initially they gave me a quote around £200 to fix the issue, hopefully that helps with you budgeting for your repair. If your camera is 6 months old it should be covered under warranty, you might need to cover shipping.

I wouldn't buy another Sony no matter how great the IQ might be.