Google Speech Api with Japanese

[Kabocha Aisu]

Have any one who using Google speak-to-text api with chrome and found that, 

Japanese or other some languages cannot receive response smoothly except English. 

I means ,when I using 'recognition.continuous = true' and  listening from speaker all the time, 

And I can receive response smoothly at beginning, but after one or two sentences translated, 

no evidence will be proved that any response was received when say anything next.

So, I turned it to 'en' and tried.  And the problem was disappeared.