my players go client side for no reson

i get this error 20:09:19
[SEVERE] java.net.SocketException: Socket closed
20:09:19 [INFO] Connection reset
20:09:19 [SEVERE] at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:116)
20:09:19 [SEVERE] at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
20:09:19 [SEVERE] at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
20:09:19 [SEVERE] at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
20:09:19 [SEVERE] at java.io.DataOutputStream.flush(DataOutputStream.java:123)
20:09:19 [SEVERE] at net.minecraft.server.NetworkWriterThread.run(SourceFile:116)
please help !!

and this

20:50:19 [INFO] Read timed out
20:50:19 [INFO] kokolme29 lost connection: disconnect.endOfStream
20:50:19 [INFO] Read timed out
20:50:19 [INFO] mattcow12 lost connection: disconnect.endOfStream
stop
please help

EDIT by Moderator: merged posts, please use the edit button instead of double posting.