This is a consequence of radio frequency interference (either intentional or unintentional). Most often, unintentional interferences are seen on the 2.4 GHz band, since it's very busy. Devices such as RF video cameras, cordless phones or microwave ovens may use this band. As for intentional interference, there are RF jammers that may interfere with 802.11 WLANs. The RF jammers may be a hardware unit or a software tool
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