I bought a Surface Pro 4 about 1 1/2 years ago via...

I bought a Surface Pro 4 about 1 1/2 years ago via the Microsoft Store. I noticed at the beginning that the battery does not come close to the promised 8-9h running time, but rather 4 hours in energy-saving mode. When that got worse, I made use of the warranty. I was then sent two replacement devices. The first did not manage to get by on a full charge for 3 hours. The second replacement device does not turn on, so it sticks to a blue screen. I sent my original device in early February, now it's early April and I'm still stuck with a broken device. So 2 months without a private PC. The support does not want or can not provide me with a correct return label. So I have to say that I do not recommend shopping through their Microsoft Store and the Surface Pro 4 was a complete failure.