I wish i knew for sure, but in my similar experiences, my #7 cylinder died (started with a skip went down hill fast for me) . What noises could you hear at the time it had happened? Do you have a code reader? Are there any leaks you can see? If so, any idea where there coming from?

 

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->Hello! Thanks for the tips! I found a great website with repair kits. I solved the problem cheaply and quickly. There were no problems with the delivery. https://vanos-bmw dot com