Artefacts since last update

Hi,
since the last osmc update I get picture artefacts.
Setup: osmc on RPi 3, TVHeadend
Before the update everything works fine.
What can I do?
How can I role back to prev. Version ?

To get a better understanding of the problem you are experiencing we need more information from you. The best way to get this information is for you to upload logs that demonstrate your problem. You can learn more about how to submit a useful support request here.

Thanks for your understanding. We hope that we can help you get up and running again shortly.

I fixed the problem:
I attached an Y cable to my external HDD so that it can get enough energy.
Dont know why this issue occurs since the last update but now everything is fine.