If you are near a router, access point or other wifi device, try moving a couple of rooms away. If that does work, then while connected through the Nikon app, change camera wifi settings to lock it onto just a specific channel — maybe a bit of trial and error here. Try channels 11, 6, 1 in that order.
The 2.4GHz wifi band is crowded with overlapping channels, all kinds of crap devices — other people's wifi, Bluetooth, baby monitors, etc. spewing radio noise, and then there are the microwave ovens.
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The 2.4GHz wifi band is crowded with overlapping channels, all kinds of crap devices — other people's wifi, Bluetooth, baby monitors, etc. spewing radio noise, and then there are the microwave ovens.