I am looking into this and have a few theories but really cannot reproduce it and therefore fixing it is becoming quite difficult. Do you find it is with a particular device or have you tried another Android device? If it is device specific that would possibly help (is it a resource issue etc).
Thank you!
Update: This may be relevant: https://code.google.com/p/chromium/issues/detail?id=476831 or https://code.google.com/p/chromium/issues/detail?id=485031