Under the same Power Options go to >Sleep > Sleep after > Setting: put 0. Afterwards the setting shows "Never".
Try the Powershell method mentioned on that page. Just download the script and run the command from where you saved it in an elevated command prompt. Worked for me!!
I know already did that, same story it still shuts down Thats the only thing i did not try Edit: Think i have posted my own solution haha, powerscript worked.