I've had my Surface 3 since the end of May, direct from MS. It has been absolutely fine until last night. I switched it on it started making a loud screeching noise, which I couldn't shut off without doing a hard stop. Next time I switched on it was fine, until tonight, switched on and this loud screeching noise, which would not stop until a hard stop. I have the sound turned off but even putting ear pods on at the jack point does not switch the noise off, or at least doesn't drown the noise. Only way to describe it is like a radio station turned up on full. Other than what came with it, Firefox, Kindle and bits out of the MS Store, I haven't installed any other software The only thing that I have done recently, about 10 days ago, was put it in an Urban Armor case. Has anyone else had similar problems or suggestions what it is. I did try the Microsoft Tech but before I get anywhere they want the tablet's number and it is hidden by the cover (and probably difficult for me to get out).