XPS 15 9550 would not come back from sleep

Hi, just got the basic XPS 15 9550 from MicrosotStore. I noticed that if either I just closed the lid, or manually select "Sleep", when press power to return the computer actually restarts (like if it had a forced shutdown) instead of waking up to where I left it. for instance, office documents will appear as recovered, browsers will appear as forced closed. 

any known solutions or suggestions on how to debug this issue?