6] Interference
Some electronic devices such as microwaves, microwave ovens, cordless phones, and Bluetooth devices can cause interference with Wi-Fi signals. Make sure your Wi-Fi device isn’t located too close to an electronic device that could interfere with your Wi-Fi signal.
Walls, doors, and other physical objects can block or weaken Wi-Fi signals. Make sure your router and Wi-Fi devices are placed in an open, physically barrier-free place.
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7] Wi-Fi network density
If many devices are connected to the same Wi-Fi network, network performance can be affected. This is especially true in public places such as office buildings or apartments with many Wi-Fi users. Try to reduce the number of connected devices or use less busy Wi-Fi channels.