本来正在正常使用中，安卓和iOS在昨天同时出现签名失败问题。以下为打印日志

2016-05-18 09:34:29.179 DigitizeSchool[1723:24149] [DEBUG] -[AVIMWebSocketWrapper webSocket:didCloseWithCode:reason:wasClean:] [Line 772] Websocket closed with code:1001, reason:Stream end encountered.
2016-05-18 09:34:29.179 DigitizeSchool[1723:24149] [DEBUG] -[AVIMWebSocketWrapper reconnect] [Line 923] Websocket connection reconnect in 1 seconds.
2016-05-18 09:34:30.180 DigitizeSchool[1723:28991] [INFO] _60-[AVIMWebSocketWrapper openWebSocketConnectionWithCallback:]block_invoke [Line 366] Open websocket connection.
2016-05-18 09:34:30.180 DigitizeSchool[1723:28991] [INFO] -[AVIMWebSocketWrapper internalOpenWebSocketConnection:] [Line 514] Open websocket with url: wss://rtm54.leancloud.cn:6799/
2016-05-18 09:34:30.446 DigitizeSchool[1723:24149] [INFO] -[AVIMWebSocketWrapper webSocketDidOpen:] [Line 700] Websocket connection opened.
2016-05-18 09:34:30.447 DigitizeSchool[1723:28991] [DEBUG] -[LCCurlScheduler logCurlOperation:] [Line 80]

------ BEGIN LeanCloud REST Request ------
path: /1.1/functions/sign
curl: curl -i -k --compressed -X POST -H 'User-Agent: AVOS Cloud iOS-v3.2.7 SDK' -H 'Content-Type: application/json; charset=utf-8' -H 'Accept: application/json' -H 'X-LC-Id: ifgrxskt4c94fygqakambga5' -H 'X-LC-Sign: 936c6f0532e61ef8abbab5506f7a417b,1463535270447' -H 'X-LC-Prod: 1' -d '{"self_id":"AE0239D93F1DFDF08529E51CC1FEDFAC"}' "https://api.leancloud.cn/1.1/functions/sign"
------ END -------------------------------

2016-05-18 09:34:30.656 DigitizeSchool[1723:28991] [INFO] -[AVIMWebSocketWrapper sendCommand:] [Line 637]

------ BEGIN LeanCloud IM Out Command ------
cmd: Session
type: AVIMSessionCommand
content: : {
cmd: session
op: open
appId: "ifgrxskt4c94fygqakambga5"
peerId: "AE0239D93F1DFDF08529E51CC1FEDFAC"
i: 7
sessionMessage {
ua: "ios/v3.2.7"
r: true
deviceToken: "83520070-3611-4759-852d-35f645dac708"
}
}
------ END ---------------------------------

2016-05-18 09:34:36.836 DigitizeSchool[1723:24149] [INFO] -[AVIMWebSocketWrapper webSocket:didReceiveMessage:] [Line 716]

------ BEGIN LeanCloud IM In Command ------
content: : {
cmd: error
appId: "ifgrxskt4c94fygqakambga5"
peerId: "AE0239D93F1DFDF08529E51CC1FEDFAC"
i: 8
errorMessage {
code: 4102
reason: "SIGNATURE_FAILED"
}
}
------ END --------------------------------

为什么本来是正常使用的没有改东西，两个客户端会同时出现4102呢？