Xbox Gamepad automatically triggers 0.7 on x & y with gamepad, mouse and keyboard active.

Xbox Gamepad automatically triggers a value of 0.7 on x & y when gamepad, mouse and keyboard are active. I''m using the new input system and two Cinemachine Virtual Cameras. Both set to Framing Transpose and Aim-POV, but with different positions

It occurs with Unity's demo projects also. The gamepad is almost new. No suspected damage.

It happens when the player idles for a few seconds, then it automatically moves in a diagonal (forward/left) direction (with normalised values 0.7). No devices are being touched when this happens.

Unfortunately I don't have another gamepad on hand in order to rule out a faulty gamepad. If I turn off the controller, it doesn't occur, but the whole reason for using Unity's new input system is to benefit from multiple devices being connected simultaneously without conflict. I've tried using the deadline processor and other troubleshooting methods.

Has anyone else experienced this?

Version 2020.3.15f2