We have two laptops located close to each other. Both acquire our wireless network with signal strength indicated as very good to excellent. For whatever reason, one loses the connection. Repairing the connection reconnects and again has excellent signal strength. Sometimes it only stays connected for a couple of minutes. The system with problem is an Avertec laptop. Device manager says the built-in mini card is working correctly, even when it has lost the signal. The other laptop stays connected for as long as it's turned on.