Video Card related lag?

[HoneyBiscuit]

Okay this is pretty out there but. . . for some inexplicable reason, if I have a youtube window open (and even not playing a video) occasionally my framerate will just tank hard. I drop 100 frames, down to 20. It goes back up when I'm standing still and not looking around, but it only goes back up to around 40. It does this until I close my browser window that had youtube open. It only does it with youtube, as no other time has this happened with any other site open. It doesn't even make sense to me, at all. All I could gather for my issue is closing youtube works. I'm 99% sure it's not the same issue, but the symptoms sounded similar.

Like previously said. Check the power supply and also the CPU temps. My laptop did the exact same thing when it was unplugged until I restarted it. The GPU just would not clock back up. Though a BIOS update remedied that problem. It could be something on your board not ramping your GPU back up, but that would still indicate a power supply issue.