“高负载”时退出状态3221225477（当数十个程序实例正在运行时）

Question

I call this compiled exe from another Go program - to synthesize audio on Windows. SpVoice() but not simpler SpeechSynthesizer API because of crackles in the audio. Everything works fine but when I have in parallel not a ten but a few dozens copies of this program (each one is called from a goroutine) sometimes I am getting 3221225477. My C# code:

using System;

using System.Runtime.Serialization;

using SpeechLib;

class Program {
    static SpVoice synth = new SpVoice();
    static SpMemoryStream wave = new SpMemoryStream();

    static void Main(string[] args) {
        synth.AudioOutputStream = wave;

        // https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms720595(v%3Dvs.85)
        wave.Format.Type = SpeechAudioFormatType.SAFT44kHz16BitMono;

        using (var stdin = Console.OpenStandardInput()) {
            using (var stdout = Console.OpenStandardOutput()) {
                var m = (Message)new System
                    .Runtime
                    .Serialization
                    .Json
                    .DataContractJsonSerializer(typeof(Message)).ReadObject(stdin);

                // https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms722610(v%3dvs.85)
                foreach(SpObjectToken voice in synth.GetVoices()) {

                    if (voice.GetDescription().Contains(m.Voice)) {
                        synth.Voice = voice;
                    }
                }

                synth.Speak(m.Text);

                var wavBytes = (byte[])wave.GetData();
                stdout.Write(wavBytes, 0, wavBytes.Length);
            }
        }

        wave = new SpMemoryStream();  // Withoit reinit will concatenate
        synth.AudioOutputStream = wave;

    }
}

[DataContract]
class Message {
    [DataMember]
    public string Voice { get; set; }

    [DataMember]
    public string Text { get; set; }
}

I found that 3221225477 mean STATUS_ACCESS_VIOLATION. I tried try/catch everything and write to logs but on such exit I found no records in Event Viewer. I run this on Windows Server 2019 on Google Cloud.

Update: I found that Wav returned from stdout even on this error.