Explanation
According to the Meraki webpage, radar and rogue AP are two sources of Wireless Interference.
Interference between different WLANs occurs when the access points within range of each other are set to the same RFchannel.
Note: Microwave ovens (not conventional oven) emit damaging interfering signals at up to 25 feet or so from an operatingoven. Some microwave ovens emit radio signals that occupy only a third of the 2.4-GHz band, whereas others occupy theentire band.
Reference: https://www.ciscopress.com/articles/article.asp?p=2351131&seqNum=2