Just to chime in,
My first Microbrute had a dead Sub input on the the mod matrix, replacement arrived today and has the pitchwheel issue. When moving the wheel up the way, there is a notable drop in pitch and then a jump to whatever I've set the bend value to.
I'm primarily on a Mac but managed to get a hold of a Windows machine and running the calibration tool fixed it, sadly only until reboot.
I feel like Arturia are doing their best to make me hate this synth even though I really really really want not to.
Hopefully a firmware update will be along soon to fix it, seems to be a whole lot of people suffering from it atm.