Wirless connection cutting out intermittently

While it's a strong signal, there is sufficient variance to suggest wrong driver or a problem with the adapter or router.

If you can easily access the wireless card through a cover on the laptop's bottom remove and carefully and firmly replace it several times to fix any potential looseness or corrosion. Make sure the antenna leads are secure.

I may have missed your response to Wayne's question:

If you do have another Windows PC with Wi-Fi check the signal strength graph to see if it gives you more of a straight line or not.