Daemon or GUI stops after a few minutes

[millemedium]

Hi! I'm new here and i need some help.
I installed namecoinj and the namecoind in Windows7 professional 64bit. I created the bitcoin.conf file and linked the namecoinj with the daemon.
Then i started namecoinj and created an account. I can see the account in the account manager tab now.
After 4-5 minutes, the account manager view is empty. Now i can not make any commands, not get info, not stop the daemon.
Windows (in task manager) not sees any problem, so i have to kill the daemon to restart client and server.
Any idea what i made wrong?
Thank you!