My wife has recently purchased the 3 button pedal and downloaded Express Scribe to use with it. On the whole all is working well, but quite frequently the pedal just stops working. No matter what you do you get no response when buttons are pressed. We have tried unplugging the USB and reconnecting and restarting the software. Sadly the only solution is to restart the PC. This is quite wearing. It's very intermittent and we haven't established a pattern for it. The machine is running Windows XP, fully up to date with fixes.