the wireless connection goes down a lot at my work network.
This would explain why updates are important for you. In this case I would also search for driver updates because this shouldn’t happen.
Anyway, this can have different reasons. First of all I would disable the WLAN power saving feature of WLAN card. This can be done in Windows power management. You have to do this for every power profile. Maybe this can help you:
http://aps2.toshiba-tro.de/kb0/HTD84026Q0000R01.htm
Wireless Adapter Settings should be set to maximum performance!
If it doesn’t help you can try a WLAN driver update. You can do this yourself and newest version can be downloaded here:
http://aps2.toshiba-tro.de/wlan/