Can't Upload Multiple Files

I'm sharing drive space and have 3.4GB of locally stored data and an uptime of 29% and i'm sharing 20GB of storage. I'm trying to upload a folder containing 4.5GB of images. Wuala starts to upload and seems to be working fine, but after like 5 to 10 minutes Wuala just dies. I dont get an error message or anything, I just place the mouse over the task-bar icon and it dissapears. Any ides?

Vista Ultimate
Athlon XP 1.2Ghz
1.5GB ram
headless file/backup server (ya ya an Athlon Xp) runs great, weeks of uptime
Wireless Lan connection to router then out to Wuala