This worked for me. Hold it on either side, put your thumbs in the middle and push in as if you are trying to bend in from the middle while holding the power button. Fifth try and it worked! Thank you so much!
Glad to hear that worked for you, just make sure you set to 'never sleep' in settings. It seems a ridiculous fix to try, but it seems to work. I dread to think how many unsuspecting customers have ended up paying £500 for a replacement that they did not need. I'll never buy a Surface again, it's shameful that Microsoft do not address this issue.