/ic/ - Artwork/Critique

Anybody have this thing?
Been using it and it's awesome 99% of the time.

But occasionally when I press a button that's bound to ctrl+alt+z for example, the ctrl and alt key remains pressed even after I release it, it kind of just locks in a pressed state.

Only happens every once in a while, but it's pretty damn annoying since the next pen stroke after the keys get stuck will start to drag and duplicate the layer instead of brushing.

Any way to fix this?