I was able to recreate the error.
Something small, like a mouse receiver, didn’t cause the error. Something a little bigger, a USB drive with an LED, did. (I used dmesg -w to check, I’m still using stock keyboard firmware)
I replaced C513 with a 220uF tantalum capacitor (that’s just what I had), and I’m not seeing the issue when using my USB drive anymore. I’ve also tried a few other devices, and nothing.
Edit: I originally added a 220uF capacitor for a total of 320uF. I didn’t like the install so I just replaced the capacitor instead. Both ways seemed to work.