There are now some dozen ways to DDOS a WiFi system. As all that is on the web I'll not dive into that.
If your router is crashing rather than recovering, see if it's firmware is current.
How possible is it for a password protected Wi-Fi router to crash a network when it is not paired to and computer or device?
Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic