Is this issue happening in your own wireless network?
Do you have the latest router firmware?
From your wireless computer pls. install and run Xirrus
Click on the 'Show Networks' to display all wireless networks on the xirrus icon on your desktop of if you have one running in a corner. Tap the Printscreen key on your keyboard, open up Paint then choose Edit from the Menu and select Paste, then SAVE it. Upload and attached it on your next post.
Also, in your computer's Device Manager locate your Wi-Fi adapter right click on it choose properties. Disable any Power Savings Mode in Power Management.
Please post an update.