Why won't the UNO drive 6 pots and I2C?

[Britenia]

I am setting up a robot arm with 6 servo control [uses A0 to A5 for potentiometer inputs] I also have I2C to a PCA9685 Servo control board. In order to do this I wire the I2C SCL and SDL to the outlets near to the reset button.

Problem is the UNO Rev 3 doesn’t seem to manage this. If I take the A4 and A5 analog pins out it’s fine but stops working when they are in. Is this because A4 and A5 are set as output for I2C?

[alphanumeric]

I would say, yes, you have a pin conflict. One or more pins trying to do two different things.