Work out what is dropping
Three faults look alike. The Wi-Fi signal disappears, one program freezes or every device loses the internet at once. Note which of the three you see, when the fault happens, which rooms are affected and whether other devices carry on working.
Compare near and far
Test one device beside the router, then in the problem room. Good results near the router and poor results further away point to coverage or interference. Poor results beside the router point to the broadband line or the router.
Look at the path to your desk
Walls, floors, distance and large furniture all weaken a signal. The position of the router matters a great deal. Depending on the building, a network cable, a wired access point or a mesh system will do more than an extender plugged in at random.
Try a cable
Connect the computer to the router with a network cable for one working day. If the faults stop, the Wi-Fi is the cause. If they continue, look at the broadband line, the router or the computer.
Keep a short log
Record the time, the room, the device and the symptom over a few working days. Add your router model and broadband provider when you get in touch. Never send a Wi-Fi password through a contact form.