python - tweepy は数時間後に停止します

Question

つぶやきをストリーミングするためにtweepyを使用します。これは私の手順です：

import tweepy
import json

consumer_key = "***" 
consumer_secret = "***"
access_token_key="***"
access_token_secret="***"

auth1 = tweepy.OAuthHandler(consumer_key, consumer_secret)
auth1.set_access_token(access_token_key, access_token_secret)
api = tweepy.API(auth1)

class StreamListener(tweepy.StreamListener):
    def on_status(self, status):
        try:
            print status.text
        except Exception, e:
            print 'Encountered Exception Tweet:', e
            pass
        return True

    def on_error(self, status_code):
        print 'Encountered error with status code:' + repr(status_code)
        return True 

    def on_data(self, data):
        if 'in_reply_to_status_id' in data:
            status = tweepy.Status.parse(self.api, json.loads(data))
            if self.on_status(status) is False:
                return True
        elif 'delete' in data:
            delete = json.loads(data)['delete']['status']
            if self.on_delete(delete['id'], delete['user_id']) is False:
                return True
        elif 'limit' in data:
            if self.on_limit(json.loads(data)['limit']['track']) is False:
                return True
        return True

    def on_timeout(self):
        print 'Timeout...'
        return True

l = StreamListener()
streamer = tweepy.Stream(auth=auth1, listener=l, timeout=36000000)

setTerms = ['enbrel']
streamer.filter(follow=None,track = setTerms)

2〜3時間後、この手順は停止します。信号エラー、タイムアウトなどはありません。ツイートが増えないだけです。私はどこで間違っていますか？