If you have a Mac there is an app called WiFi Explorer that works very well. The types of dropouts discussed are most likely a hardware issue but who knows. Maybe there is severe RF interference nearby.
My internet and television signals drop out intermittently. Most often it doesn't last more than a minute or two. I catch it about 4 or 5 times a month. How often it happens when I'm not using my system is unknown. I don't have an RF Analyzer that I ...