Occasional `Sync input too long` error response ?

[playahater]

Hi,

i'm having issues with nodejs client.
I'm using node v8.8.1 and "@google-cloud/speech": "^0.11.0"

Sometimes I get:

debug: Error: Sync input too long. For audio longer than 1 min use LongRunningRecognize with a 'uri' parameter.
    at /srv/http/career/node_modules/grpc/src/node/src/client.js:554:15

For the same file, the request 3s later returns success:

debug:  wpm=197

I'm using this method to transcribe an audio:

    private encoding: string = 'FLAC';
    private sampleRateHertz: number = 16000;
    private languageCode: string = 'en-US';

    private async recognize(buffer: Buffer): Promise<any> {
        try {
            const client = new speech.v1.SpeechClient({
                keyFilename: `${process.env.PWD}/${config.speechToText.service_account_json}`,
            });  
            return await client.recognize({
                config: {
                    languageCode: this.languageCode,
                    sampleRateHertz: this.sampleRateHertz,
                    encoding: this.encoding,
                },   
                audio: {
                    content: buffer.toString('base64'),
                },   
            });  
        } catch (e) {
            throw e;
        }    
    } 

I have a retry delay and total count of max 3 retries.
There is no pattern. Sometimes i get success on second request [ retry ], sometimes all three retires fail.
Files are correctly encoded and not longer than 60s. Which above debug messages prove.
I'm trying to figure out the issue for a while now and can't reproduce it or pinpoint the reason. It happens on some occasions. Google console states that around 40% of requests are failing in my case.
Any clue why may this be happening?

Thanx in advance,
Best

[fhinkel]

If the issue still persists, please file it here. Thank you.