The Mavic bleeds a lot of energy. I am sure you have seen videos of Mavic unboxings, and as soon as they turn the Mavic on, you hear bussing in the filming camera's audio. Think about it... This thing can send HD video back from over 4 miles away! It's got a high powered, digital transmitter on board. It's gonna cause some interference, with it's multi channel transmission.
To fix the issue, you may want to put your house's wifi on a different channel, or use "auto", which will look for a frequency with low interference. Many wifi routers default to channel 6 or 11, or are set to something else. Also, it will depend on what type of wifi you are using. Are we talking about B? G? N? AC? Dual Band N+AC?