Why Session stopped automatically when using speech_recognizer.start_continuous_recognition() by adding phrase?(API by Python)

Question

Hi,

When I use api written by python, I found that when I use 'speech_recognizer.start_continuous_recognition()' while adding PhraseListGrammar to recognize an audio file, the session would stop automatically somehow. Therefore, the result text I got is only a part of the full audio. Meanwhile, without adding PhraseListGrammar, the program can run normally that I can obtain a full result text recognized.

Is there any restriction on the length of the audio when utilizing 'speechsdk.PhraseListGrammar.from_recognizer(speech_recognizer)' ??
Or is there any wrong with my programming code?

The specific details are following:

length of audio file: 　about 1hour.
Session stopped when 10 minutes has passed from when the speaker start to speak.

Phrase Amount: over 1,000.

code in python:

def speech_recognize_continuous_from_file_addphrase(audiofile, phraselist):  
  
        # <SpeechRecognitionWithFile>  
        audio_filename = audiofile  
        audio_input = speechsdk.audio.AudioConfig(filename=audio_filename)  
        speech_config = speechsdk.SpeechConfig(subscription=speech_key, region=service_region)  
        # Ask for detailed recognition result  
        speech_config.output_format = speechsdk.OutputFormat.Detailed  
        # Creates a recognizer with the given settings  
        speech_recognizer = speechsdk.SpeechRecognizer(speech_config=speech_config, audio_config=audio_input, language="ja-JP")  
  
        #Adding phrase list  
        phrase_list_grammar = speechsdk.PhraseListGrammar.from_recognizer(speech_recognizer)  
        for phrase in phraselist:  
            phrase_list_grammar.addPhrase(phrase)  
  
        # Starts speech recognition, and returns after text is recognized.  
        done = False  
        result =[]  
        print("Recognizing...")  
  
        def recognized(evt):  
            result.append(evt.result.text)  
            return result  
  
        def start(evt):  
            print('SESSION STARTED: {}'.format(evt))  
  
        def stop(evt):  
            print('SESSION STOPPED {}'.format(evt))  
            speech_recognizer.stop_continuous_recognition()  
            nonlocal done  
            done = True  
  
        speech_recognizer.recognized.connect(recognized)  
        speech_recognizer.session_started.connect(start)  
        speech_recognizer.session_stopped.connect(stop)  
  
        try:  
            speech_recognizer.start_continuous_recognition()  
            while not done:  
                time.sleep(.5)  
        except KeyboardInterrupt:  
            print("bye.")  
            speech_recognizer.recognized.disconnect_all()  
            speech_recognizer.session_started.disconnect_all()  
            speech_recognizer.session_stopped.disconnect_all()  
                  
        return result  

Sorry for my poor English, if you want to know any more information, please let me know.
Thank you.

Rakuwa