Audio Source Mic works on first run and then breaks

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I am trying to work with my built in microphone to create some audio reactive objects. When I open my project and hit play the objects react as I would expect. After stopping the project and hitting play again I get no input. I try a few times to no avail and then suddenly after some time has passed it starts reading the mic again for one run.

I have an audio source attached to my main camera where the fft.cs script is also attached

3206440–245318–fft.cs (2.59 KB)

2 
using UnityEngine;
using System.Collections;
using UnityEngine.Audio;

[RequireComponent(typeof(AudioSource))]
public class fft : MonoBehaviour
{
    public bool startMicOnStartup = true;
    public int numOfSamples = 1200; //Min: 64, Max: 8192

    public AudioSource aSource;

    public float[] freqData;
    public float[] band;

    public GameObject[] g;

    void Start()
    {
        freqData = new float[numOfSamples];
        aSource = GetComponent<AudioSource>();

        aSource.clip = Microphone.Start(null, true, 10, 44100);
        aSource.Play();

        int n = freqData.Length;

        // checks n is a power of 2 in 2's complement format
        if ((n&(n - 1)) != 0)
        {
            Debug.LogError("freqData length " + n + " is not a power of 2!!! Min: 64, Max: 8192.");
            return;
        }

        int k = 0;
        for (int j = 0; j < freqData.Length; j++)
        {
            n = n / 2;
            if (n <= 0) break;
            k++;
        }

        band = new float[k + 1];
        g = new GameObject[k + 1];


        for (int i = 0; i < band.Length; i++)
        {
            band[i] = 0;
            g[i] = GameObject.CreatePrimitive(PrimitiveType.Sphere);
            //g[i].renderer.material.SetColor("_Color", Color.cyan);
            g[i].transform.position = new Vector3(i, 0, 0);

        }


    }

    void Update() {
        aSource.GetSpectrumData(freqData, 0, FFTWindow.Rectangular);
       

        int k = 0;
        int crossover = 2;

        for (int i = 0; i < freqData.Length; i++)
        {
            float d = freqData[i];
            //Debug.Log("freq data: " + freqData[i] + "\nband[k]: " + band[k]);
            float b = band[k];

            // find the max as the peak value in that frequency band.
            band[k] = (d > b) ? d : b;

            if (i > (crossover - 3))
            {
                k++;
                crossover *= 2;   // frequency crossover point for each band.
                Vector3 tmp = new Vector3(g[k].transform.position.x, band[k] * 32, g[k].transform.position.z);
                //Debug.Log(band[k]);
                g[k].transform.position = Vector3.Lerp(g[k].transform.position, tmp, .1f);
                Color32 color = new Color32((byte)(50 * band[k]), (byte)(10 * band[k]), (byte)(100 * band[k]), 0);
                g[k].GetComponent<Renderer>().material.color = Color32.Lerp(g[k].GetComponent<Renderer>().material.color, new Color32(color.r, color.g, color.b, color.a), .1f);
                band[k] = 0;
            }
        }
    }
}