CAN’T CONNECT IN THE KITCHEN
If your devices have trouble connecting in a specific room that isn’t related to how far you are from the router, the likely culprit is network interference from other equipment, such as older cordless phones or even your microwave. This tends to affect the 2.4GHz band most — switching to the 5GHz network may help, though that band’s shorter range may itself pose a problem.
If that doesn’t work, consider updating your cordless phone to a newer DECT model (make sure it’s DECT 6.0, which avoids interference with Wi-Fi). Otherwise, leave your kitchen while using the microwave. Test other wireless gadgets — radiocontrolled cars, for example — and cheap wall chargers by switching them off. If your Wi-Fi signal improves, you’ve found the culprit.