Azure web sites - 500 internal server error (The specified network name is no longer available)

I am running a service on Azure web sites using PHP. From times to times, the server completely stops responding with a 500 HTTP message. So far, I could get these relevant details on the error:

ModuleName: FastCgiModule Notification: EXECUTE_REQUEST_HANDLER HttpStatus: 500 HttpReason: Internal Server Error HttpSubStatus: 0 ErrorCode: The specified network name is no longer available. (0x80070040) ConfigExceptionInfo:

The only info I was able to find was that this might be a prevention of DoS attack when the server stops executing the scripts (for some limited time?). I solve this now by restarting the server which is not good at all.

As I am unable to find an exact cause of this, I am looking for a better solution than manual restarting or even a hint on how to debug the problem. Thanks