Could be a dodgy on/off button, or perhaps power cable or video cable not properly fitted - maybe just a bit loose.
If it is still under warranty and the on/off proves to be faulty, perhaps you could ask for it to be sorted or exchanged.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.