Hello Can you please check and see if your suface 4 actually sleeps set it to ask for a password when wake up from sleep then put it to sleep and see if it asks you for a password if it doesn't that means it doesn't sleep at all thats what mine is doing I'm currenty speaking to ms about this because this is my second device I have received from Ms or should i say a (refurbished unit) with the same issues and now I'm going through the process of a refund now im waiting to see if they are going to honour the refund or not i have been going back and forth with ms about this problem and i have only had the sp4 i7 16gb 512ssd for only 3 weeks and ther is no ms store in melbourne australia so i hade to sent it to them and they sent me a refurbished 1 back that was a kick in the guts and now it doesn't sleep at all!!! i give up cant do this with ms no more thats why im opting for a refundA final post on this one....
Seems like the last update solved the issues. Since then it has been waking up everytime and I've not had to reset it once.