Every time I type anything with the main keyboard of my laptop, there is suddenly a massive spike in lag and inputs will get randomly dropped if i'm typing at any kind of normal speed. (E.g. "suddenly a" somehow turned into "suddya".) That said, external keyboards do not cause this; only the in-built one. It happened last night too, not too long after my mousepad setting was randomly turned off by accident. I've restarted the PC twice since then, and nothing has changed.
Beyond, the linked images, my specific laptop model is "BMAX."