请问有人用过 slackbot 吗?几个小时不使用就会断了的情况有人遇到这吗?

最近在使用 slack + hubot 做机器人 但发现长时间(两小时之后) slack 的机器人就会离线了 不知道是不是服务挂在 ddns 下的原因呢?

日志如下:

[Wed May 25 2016 16:42:29 GMT+0800 (CST)] INFO Slack client now connected

[Wed May 25 2016 17:39:13 GMT+0800 (CST)] ERROR Last pong is too old: 10.668

[Wed May 25 2016 17:39:13 GMT+0800 (CST)] INFO Reconnecting in 1000ms

[Wed May 25 2016 17:39:14 GMT+0800 (CST)] INFO Attempting reconnect

[Wed May 25 2016 17:39:14 GMT+0800 (CST)] INFO Connecting...

[Wed May 25 2016 17:39:15 GMT+0800 (CST)] INFO Logged in as bus of Kenshinhu, but not yet connected

[Wed May 25 2016 17:39:18 GMT+0800 (CST)] INFO Slack client now connected

[Wed May 25 2016 17:39:40 GMT+0800 (CST)] INFO Slack client closed, waiting for reconnect