Looking for Cocos2d Expert for fine tuning game in html5

We are currently working on a mobile game/app in html5 and we are in need for some assistance from a Cocos2d expert. We are pretty close to completion but we are very inexperienced with Cocos2d so we are running into many issues.
Some client has black screen, or freeze screen. Players send us the logs, but there are no error. We use Cocos2d js in html5. We need an expert in js and cocos2d for optimization (we already packed the texture and the code).

You will be in constant contact with me. We estimate 2 day of work (600€).

If you think you may be able to give assistance please email at geraud@pinpinteam.com