Hey I'm having PC issues. My GPU usage is fairly workable when I first open up my computer, but eventually something will trip it up and it will start going into a spiral of constant spikes, freezing my computer for a split-second every few seconds.
I have an NVidia Geforce GTX 660.

Here's an image of it ripped from MSI Afterburner, where you can see a visual representation of what I mean. You can see the "normal" part of it functioning at the beginning, and then it starting to spike. Each one of those spikes represents a small freeze of maybe somewhere from an eighth to a quarter of a second.
I took my graphics card out and gave it a dust cleaning, which fixed the problem for about an hour and a half before it started up again.
I suspect this is just my graphics card aging and accumulating problems- at this point, it's a few years old. If it isn't, though, and somebody here recognizes this problem and has some sort of solution, I'd love to hear it.