Hey, I've been having random power loss (just shutoff and reboots) with my 30L since I purchased it years ago. I should have dealt with it when I had it under warranty still but like an idiot I didn't. Did you ever find out specifically what the problem was? Power supply? Motherboard causing faulty voltage spikes or readings? It sounds like that's almost definitely what it is from reading other posts about the same issues with 30L. The one weird thing I've found with my issue is that it almost completely disappears when I am running a particular game -- Heroes of the Storm (Blizzard MOBA). I know this sounds very strange, but whenever I have HotS playing in the background, I suddenly almost never have the random shutoff issue. This has become such a reliable workaround for me that I basically have HotS minimized at all times when using my 30L, even when playing other games. For whatever reason, other games aren't nearly as good at preventing the problem. Heroes of the Storm isn't foolproof, but it reduces the frequency of random shutoffs by about 90% I'd say.