s3 uploader issue connection hopping

const (
    awsBucketRegion = "YOUR-BUCKET-REGION"
    awsBucketName   = "YOUR-BUCKET-NAME"
    partSize        = 5 * 1024 * 1024
    maxRetry        = 1
)

// AddFileS3 add a new file to the multipart.
func AddFileS3Compressed(fileName string, reader io.ReadCloser) (*s3manager.UploadOutput, error) {
    // Create a single AWS session (we can re use this if we're uploading many files)
    cfg := &aws.Config{
        Region:     aws.String(awsBucketRegion),
        MaxRetries: aws.Int(maxRetry),
    }
    // with logger need to be added.
    svc := session.Must(session.NewSession(cfg))
    uploader := s3manager.NewUploader(svc)
    uploader.PartSize = partSize

    result, err := uploader.Upload(&s3manager.UploadInput{
        Body:   reader,
        Bucket: aws.String(awsBucketName),
        Key:    aws.String(fileName),
    })
    if err != nil {
        return nil, err
    }
    return result, nil
}