question about how to connect again if don't stop io

[gebogebo]

in the examples, if meet exceptions, io stop is used. But if I don't want to stop the io and connect again after a while, how to release the transport, ws_clinet quickly.

if the server runs after my program, afeter several times, it will connect successful.
But if i use io stop, it will connect ok at the first time.

[gebogebo]

Now, i finished my program. it can run well if the target server is running at the same time.
But if I don't start the server , and i will use the same io to connect the server every 10 seconds, about 400 tims, my program crash with exception thown, i don't get it why.
If i run io.stop everytime when connection failed, my program will run well.
How can i keep connecting every 10 seconds while i don't stop the io?