I tried the deezer music preview app which is in the store. I leaved it running in the background, took down the lid, and then it crashed after sleep. I have also tried older graphics drivers and noticed that the win+p trick now worked, but that's because the computer fails go in sleep mode, so that's not any solution either. Now I have joined the insider program on the slow ring, maybe there will come update soon to fix it, but I doubt it =(
The best thing I can do for now is to use hibernate instead of sleep, it takes like 5 seconds longer to boot. At least it doesn't crash and loose data, so I guess I can live with that. But just because of this I wouldn't recommend anyone buying it for that price MS is asking, it's just not acceptable. Shame because the rest is almost perfect,.