Wer hatte die gleiche Frage?

I've just bought a new PC, the Medion Desktop PC i5 16GB 1TB from the Aldi site.

I've been impressed with how fast the PC is, but it has a couple of niggly faults. Sometimes it won't switch off, and I have to turn it off by pressing the ON/Off button, ans sometimes when it's in sleep mode it won't wake up when I use the keyboard or mouse, and I have to manually switch it off then on using the On/Off button.

I assume this is a software problem? Can anyone give me some advice on how to fix the problem, please?