The schedule about Mobile Push Service on Windows Azure often don’t work. Who can tell me why?

The steps:
In theScheduled Tasks , we get user phone token by search in DB,about5-6million , then push them one by one by Mobile Push Service.

The Issue:

The schedule about Mobile Push Service on Windows Azure often don’t work. And at that time the log recorder also was not enabled.

Sometimes, after waiting a few hours later, the task resume work itself.

All things, JustForU