Differences between average online times

Hi (again in a short time) folks :-)

I joined Wuala on April 29th and have been running the client (GUI on Windows Vista Pro. 64bit) since. At the beginning I thought the hardly increasing average online derives from the algorithm calculating the average online time, but since I have installed Wuala on a Linux-client as well and saw how "fast" the average online time is increasing (in a short while the Linux-client made it up to 21% while the Windows-client is still around 12% even it shortly hit 14%) I am now wondering why. Both machines are up and running 24/7. I already checked if there has been a problem in the connectivity of the Windows-machine but there wer just a few small outages (2/week on average relating to a change of the IPA by the provider due to the dynamic IPA-thingie most German providers are into) of less then one minute each.

br,
Kristof

P.S. #1: Client is connected via two level one WAP-0009 APs doing the wireless stuff and a D-LINK DI-524 which is responsible for the uplink to my provider (cable).
P.S. #2: Client has been restarted a few times over the last week.
P.S. #3: My Wuala-username is Korwisi.