I will make sure to try this, sorry for the late reply.
I haven't had these problems too bad in the past couple days now, but for some reason today it seems to have a 50% chance of recording at like 4 fps instead of 30. I recorded some gameplay earlier, and the first 2 turned out at 3-5 fps or something, unusable. And then awhile later, I recorded 2 more gameplay videos. The first of these turned out fine, 30 fps, and then the second which was started about 20 seconds after the first one finished with no settings or anything changed in between turned out again at a very low framerate (unusable). The whole ~25 minute video is like this.
Apparently the file just appears to be at 3-5 fps. Both when I watch the M2TS and when I pull it into the editor it's really slow, but the uploaded result to YouTube had regular framerates. I don't understand why this would be and why this only happens on *some* of the files when I'm not changing anything in between them.