From range issues to channel issues and more. So here we have the old "it's failing" post but sans detail.
Skipping past that I use WiFi Analyzer on my Android phone to check out my WiFi around the house for coverage and interference. I also have found a few routers out on channel 14 which here will cause drops like you noted.
For now, drop the distance from router to laptop to half what it is and see if the situation improves.
Be sure the router firmware is the latest.
My Dell laptop tells me my wifi drops and there is no internet connection. Ido not see this on my phone, but hos can I tell when it is really down when It can pop back on with out notice? Is there simple device out there that can monitor the wifi in my home?