I haven't had this specific issue, but a similar one (which I was looking for an answer for). I'm using 3 voices out CV to my Eurorack, and any time I hit the "shift" button, the pitch drops on all three voices. As soon as I release shift, it goes back up. I think for both of us, it might be a power supply issue? I'm currently powering it over USB, but thinking I'll switch to the dedicated power and see if it's better.