We recently implemented software licensing and updates/downloads service 
using gae.
It's been working nicely until now.

Now suddenly the downloads stopped working.
We haven't made any changes to the code, the downloads just stopped.

Now when I try to download a file that's about 60mb, it downloads around 
1.5mb and stops.

Relevant details:
class DatastoreFileModel(db.Model):
    blob_key = blobstore.BlobReferenceProperty(required=True)
    filename = db.StringProperty(required=True)
    uploaded = db.DateTimeProperty(required=True)
    hash = db.StringProperty(default='')

class FileUploadHandler(blobstore_handlers.BlobstoreUploadHandler):
    def post(self):
        blob_info = self.get_uploads()[0]
        file_info = DatastoreFileModel(blob_key=blob_info.key(),
                                       filename=blob_info.filename,
                                       uploaded=datetime.now())
        db.put(file_info)

class FileDownloadHandler(blobstore_handlers.BlobstoreDownloadHandler):
    def get(self, file_id):
        file_info = DatastoreFileModel.get_by_id(long(file_id))
        if not file_info or not file_info.blob_key:
            self.error(404)
            return
        self.send_blob(file_info.blob_key, save_as=True)

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