Problem while mining ravencoin

I have a problem when trying to mine ravencoin. I have an octominer motherboard and 3 gpus, 2 1080ti and 1 1080. It all works fine when mining eth with phoenixminer, all 3 cards pull around 600 watts, maybe 650 at peak, and i have a 1000 watt server psu. The problem raises when i attempt to mine ravencoin, what happens is that my computer just reboots out of nowhere. What can be happening? I doubt it is a psu issue, since 1000 watts are more than enough, and also it feels weird because it works fine for ethereum mining, i have had it non stop mining for months and only the usual windows reboots happened. So what can be happening?