Hi Alex, when you encountered the problem, is your laptop plug into the power outlet or it's in battery mode? you can try setting the power option of your wireless card to maximum performance to ensure the disconnect is not due to your card is saving power for your laptop.
screenshot of the setting in win7 can be found below:
I have his problem since the buyout of my new laptop, from the first days. I encounter this problem in both modes, battery and plugged, so it's not from that. Also I don't have such an option in the adapter settings but all my power-connected options are on max performance.