Performance overlay randomly appears, doesn't go away

[Greywander]

I've had the performance overlay just randomly appear a couple of times previously, and again just now. I can't seem to get it to go away. It's already set to "off" in the settings, and if I restart the game it's still there. Resetting the deck seems to be the only way to get it to go away, which is annoying if it appears in the middle of a boss fight or something.