VRInput.GetDown only working intermittently

This only works... sometimes. I can't figure out any pattern.

It will work fine, and then I move the player and... nothing. And If I wait a while or move again and get lucky... It starts working again. I'm new to this and must be doing something obvious wrong.

 void Update()

    {

        if (OVRInput.GetDown(OVRInput.Button.One))

        {

            Debug.Log("Button Pushed!");

            AudioSource audio = GetComponent<AudioSource>();

            audio.Play();

        }

    }