kawpow algo has high power consumption. hangs and restarts the system because it cannot provide enough power to the graphics cards. lower the clocks of the cards to 3/4 as well as the millivolt voltage.

Check out this guide
How to Mine on RaveOS: Detailed Guide and Mining Setup
https://2miners.com/blog/how-to-mine-on-raveos-detailed-guide-and-mining-setup/
Raveos is a very easy system to set up. I connect the monitor and see how the miner works.
Common reasons for a reboot would be overclocking or low power limit. First, start the system on default settings.
If you have not done technical listening, then clean all the raisers and contacts of the video card.