Leave LW open over night, found it disappeared in the morning.

It happened 3 times now and I've done some forum search but found no similar post. So I think I should post this.

I've no problem downloading/uploading files. I up/downloaded more than 2 GB from limewire now.

But every time I leave it open over night, it just isn't there when I woke up. I then try to run LW again, it starts normally just like nothing has happened. No error message or something like that at all.

I never use "shutdown after transfer" option. Or even if I use it, it shouldn't shut itself down since many of my downloads is still incomplete by the time I woke up.

My system :
Windows XP SP2
LimeWire 4.8.1
Java 1.5.0-01
ADSL 512/256


Thank you for your time ^^