It's a Minisforum UM690S. Currently I've turned off WiFi, and there are no other devices nearby with Bluetooth turned on. I have a laptop and phone nearby that are on WiFi.
I just tried to have a gaming session a bit closer to where I would typically sit. It would sometimes work flawlessly for a long time, but then it would enter a period of lag and missed button presses. I can't think of whether there would've been anything that started interfering at the times it started lagging. The keyboard can be pretty unresponsive very close to the computer as well. This keyboard has worked perfectly with another mini-PC at my desired distance that this computer meant to replace.