Wireless DoS attacks can be the result of:
Improperly configured devices.
Configuration errors can disable the WLAN.
A malicious user intentionally interfering with the wireless communication. Disable the wireless network where no legitimate device can access the medium.
Accidental interference
WLANs operate in the unlicensed frequency bands and are prone to interference from other wireless devices.
May occur from such devices as microwave ovens, cordless phones, baby monitors, and more.
2.4 GHz band is more prone to interference than the 5 GHz band.