There have been a few reports of keystep pro’s CV gate bugs. I have experienced myself a few already.
One of the most severe and urgent ones is CV gate drops. Have a look at a previous report at the legacy forum : CV Gate Drop (BUG)
When I play notes in succession fastly, sometimes I get gate drops in the succeeding notes, hence the note stopping. I confirmed this with a oscilloscope. Whenever it happens, I have to reset the keystep pro, either factory reset or turn off/on. This is really annoying and frustrating.