Wireless disconnect all of a sudden and then adapter is not found until the reboot!

I am currently using Acer Aspire 4740 G with Windows 7 Home Premium. Previously, the problem I encountered was that the wireless card is not found when you turn on the laptop with the battery. The problem could be fixed by restarting until the adapter is found, or just plug in the power cable.

Recently, the problem has gotten worse. Even when it's current alternative, my wireless connection will suddenly shut off and then the adapter is not detected until the reboot. In network connection, the adapter is shown, but it shows disabled. When I click on him allow, the popup notification enabled but in the network connection is still disabled. When I try to uninstall the card and try to install it back, the adapter is gone until I restart.
They follow methods I've tried.
-Under the management of the power of the adapter, I unchecked "allow the computer to turn off this device to save power".
-Using a power high performance
-Updated my wireless adapter for Qualcomm Atheros AR5B93 v10.0.0.234 (do not know what is the most recent, can anyone verify this for me?)
The only way to solve the problem now is to restart the laptop. However, the problem will occur again in about an hour or 2, but it's embarrassing!

Not sure if this helps, because my problem seems to be fixed now.

I have been uninstalled Tuneup Utilities. I remembered before installing Tuneup, the problem occurs only when my laptop was disconnected and running on battery power. After the installation of Tuneup, this occurs even it is plugged. Looks like than Tuneup messed my network or power management.
Thank you guys for trying to help anyway.

Tags: Windows

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