System process takes up 100% GPU time for 1.0-2.0 seconds.

I have a Win10 Samsung laptop running an i7-6500U, 12GB RAM, and the video is Intel HD 520 and Nvidia GeForce 940MX.

10 days ago I started getting periodic stuttering, where everything froze up for a second. Task Manager shows System using 100% of GPU0 (Intel GPU) for about a second right after the freeze-up clears. Right after that windows error reporting process showed up, took 100% GPU for a fraction of a second, and then closed.
I disabled error reporting, and so I'm just down to System taking up 100%, which makes the total time it remains frozen up about 1.5 seconds. I haven't been able to figure out the cause of System taking up 100% for that second of time. It happens at a variable rate, so it'll be good for 2 minutes, then do it 3 or 4 times in quick succession.

I suspected a bitcoin miner, and I've run MalwareBytes but it found nothing. I was reading on file-less coin miners, but also found no real explanation on how to figure out if one is running.

Other steps: I've checked for driver updates and Windows Update is all current. Autoruns didn't have anything suspicious in it, and ProcExplorer didn't have any smoking guns in it, though that is how I discovered error reporting was starting and immediately closing afterwards.
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