ZMQ 3.0 ZmqContext.Create() After a period of time can not work

[reakipanyi]

I have met at least three times, when the program is running a few days later, the client program or Server program using (ZmqContext) = ZmqContext.Create (context) will be stuck, I need to restart the server to work properly

This is my code
Server:
using (ZmqContext context = ZmqContext.Create())
using (ZmqSocket server = context.CreateSocket(SocketType.REP))
{
server.Bind("tcp://*:9800");
while (true)
{
.....
}
}
Client：
using (ZmqContext context = ZmqContext.Create())
using (ZmqSocket client = context.CreateSocket(ZeroMQ.SocketType.REQ))
{
client.ReceiveTimeout = new TimeSpan(0, 0, 30);
client.Connect("tcp://127.0.0.1:9800" );
string con ="...";
client.Send(con, System.Text.Encoding.Unicode);
string Recv = client.Receive(System.Text.Encoding.Unicode);
.....
}