07/10/15 07:00:38 Reading data...
07/10/15 07:00:38 INCOMING:
<stream:error>
<ack>
</ack>
</stream:error>
​
07/10/15 07:00:38 Checking processes... not working
07/10/15 07:00:38 MESSAGES: 0 - READ: 0
07/10/15 07:00:38 Reading data...
07/10/15 07:00:38 INCOMING:
<stream:close>
</stream:close>
​
07/10/15 07:00:38 Checking processes... not working
07/10/15 07:00:38 MESSAGES: 0 - READ: 0
07/10/15 07:00:39 Socket error: Connection closed by server.
07/10/15 07:00:39 Connection closed.
07/10/15 07:00:39 Stopping timers.
07/10/15 07:00:39 Freeing up the connection.
07/10/15 07:00:39 Freeing up the socket.
07/10/15 07:00:39 Retry the connection in 10 seconds.
07/10/15 07:00:39 Connection status: disconnected
07/10/15 07:00:39 Disconnection done
07/10/15 07:00:49 Starting new connection
07/10/15 07:00:49 Checking if already connecting
07/10/15 07:00:49 Checking active network
07/10/15 07:00:49 Connection status: connecting
07/10/15 07:00:49 Connecting to c2.whatsapp.net:443...
07/10/15 07:00:49 Connection status: connecting
07/10/15 07:00:49 Connected successfully

I have seen that many changes in yowsup (V.2.4) have been made, Protocol-Update (S40 env to 2.12.96), E2E-Encryption enabled etc... This Changes are not implemented in Whatsup 1.2.7 and these are perhaps the causes of problems currently?
https://github.com/tgalal/yowsup/releases/tag/v2.4