Hello, no, I found it's actually not the slider but all my Virpil Hotas Axis. I have another device with axis, a simgears ICP and and this one is not affected. And the key recognition is not enabled.
I cannot make it crash again (I move my hotas to other usb ports. But the Foxvox window is still freezing for a few seconds after I use any of my axis, and in game it creates some lag when I'm using fov zoom. I did not have the same behavior when using VA for example. And my control software was not running. It's like the app is reading input like crazy.