"The Wi-Fi works fine in the living room but drops out completely upstairs" is one of the most common calls I get. Before assuming you need new hardware, a few quick checks usually explain what's going on.
Where's your router actually sitting?
Routers are often shoved in a cupboard, behind the TV, or in a corner of the house furthest from where you actually use the internet. Wi-Fi signal weakens through walls, floors, and especially anything metal (like a fridge or a filing cabinet). Central, elevated, and out in the open beats tucked away every time.
Check which channel and band you're on
Modern routers broadcast on both 2.4GHz (longer range, slower) and 5GHz (faster, shorter range). If everything in your house is trying to squeeze onto the same crowded 2.4GHz channel as your neighbours' routers, things slow down. A quick channel change can fix a surprising number of "random" dropouts.
Consider mesh over a single powerful router
For bigger homes or ones with thick walls, a single router - no matter how expensive - often can't cover every room evenly. A mesh Wi-Fi system (multiple small units placed around the house) usually solves dead zones far more reliably than one powerful box in the hallway.
When it's worth calling someone in
If you've moved the router, restarted everything, and you're still fighting dropouts in certain rooms, it's often faster to have someone come and actually measure the signal room-by-room and set things up properly - rather than guessing with trial and error. That's exactly the kind of job I help with, and a home Wi-Fi visit usually sorts things out in under an hour.