I've been having a problem for the past couple of weeks. When I turn my computer on I usually have no internet connection or it is limited. When it is limited I will have a connection for about 10 seconds and then it will drop completely for 3 or so seconds before picking back up. I've found that if I un-install my wifi drivers and then re-install them, my connection is fine and stays up the whole time the computer is on. Then the whole process repeats when I turn my computer off and I have to re-install the wifi drivers the next time I turn my computer on.