I bought this keyboard today and was shocked: it is curved! It doesn't even rest on the front rubber feet, so it slides away easily. So at this price, phew. And this from Logitech. This has already been criticised on YouTube in this video: https://www.youtube.com/watch?v=xzna7HOmBpU, starting at minute 7:25. Have any of you also experienced this problem? If so, what did you do? Warranty claim? Thank you very much for your answer.