Having WiFi Troubles? This Common Household Appliance May Be To Blame
Briefly

Microwave ovens and Bluetooth devices on the same frequency as WiFi networks can cause signal disruption. Thick walls and electronic devices like baby monitors can also obstruct and weaken WiFi signals.
Trevor Cooke suggests placing the router away from the kitchen and microwaves, using the 5 GHz band, limiting Bluetooth device use near the router, and investing in devices that minimize interference with WiFi signals.
Read at HuffPost UK
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