Hi,
It sounds as if the computer is unable to maintain the wireless connection. I came across the following suggestion when a friend had a similar problem - (this will only be possible if you are using windows to configure the wireless settings - that will become obvious at step 4!):
Usually this behavior occurs when your connection is configured to use 802.1x Authentication but your current hardware does not support it. To correct the situation all you need to do is disable this authentication process. To disable it, just follow these steps:
- Click Start, select the Control Panel, and double-click the Network Connections icon.
- The Network Connections screen will appear. Right-click the Wireless Network Connection and select Properties.
- On the Wireless Network Properties page you'll see three tabs. Select the one that says Wireless Networks.
- Select your network connection from the list of available networks and press the configure button.
- Now click the Authentication tab.
- The Authentication screen will open. Remove the check mark in Enable IEEE 802.1x authentication for this network.
- Click OK to close the window and then close all other open windows. Reboot your computer.
Hope it works for your mum.