Have you performed a driver update for wireless at all?
Do any other systems experience the same issues at the same time that are on wireless? ( * To test this I would have 2 wireless computers connected to this same wifi and perform a persistent ping and look to see if the connection only drops out on the 1 computer or both at the same time. To do persistent ping run something like:
ping
www.google.com -t
from command shell which you can get to by Start-RUN->CMD or entering CMD in Search window of Windows 7 or 8 etc to bring up command shell.
If the problem is showing ping problems at the one laptop only then you know its specific to that 1 computer, however if both systems are having issues then you know its a wireless issue ( or ) the internet connection is dropping out and coming back which can be modem, router, or service provider issue.