Bug Arduino/firmata and potentiometer

I use vvvv and Firmata to connect a simple potentiometer. I uploaded the standard Firmata on my Arduino and used the help patch FirmataBoard. However, VVVV doesn’t receive any information from my potentiometer. If I disconnect and reconnect the patch cons(firmata)VL manualy, vvvv works normally, and I receive the information from my potentiometer.
But I need for an installation to Stop/restart my computer every day and it’s not possible with the bug. The potentiometer disconnects if I restart the computer. I tried with a switch patch to disconnect the patch cons, but nothing connection.
Can someone help me fix this bug? Thank you
Best regards