WiFi Problems: Causes and Pro Solutions (French Riviera)

Start by locating your symptom — each branch points to a different likely cause:

• WiFi is slow everywhere, all the time → suspect the internet line or the central equipment. Run a speed test over Ethernet directly on the box: if it's just as bad, the problem is with the provider or the line. If it's good wired but bad on WiFi, the culprit is your radio equipment (ageing box, bad channel, saturation).
• WiFi is slow only at certain times → congestion: too many simultaneous devices at home, or interference from neighbouring networks at peak hours (very common in Nice apartment buildings). The 2.4 GHz band suffers first.
• The connection drops intermittently, everywhere → line instability (have the ISP check it), an overheating box, faulty firmware, or strong intermittent interference (weather radar triggering DFS on 5 GHz, microwave oven, baby monitor).
• One or more rooms have little or no signal → dead zone: a propagation problem (distance, load-bearing walls, concrete slabs). This isn't a fault but a coverage issue — solving it (placement, extra access points, mesh or wired) is covered in detail in our complete WiFi coverage guide.

1. Radio channel saturation. On 2.4 GHz, only three channels don't overlap (1, 6, 11). In a building in Nice or Antibes, twenty networks may share those three channels: everyone waits their turn to talk, and speeds collapse at peak times.

2. Under-sized or ageing equipment. A consumer box struggles beyond 15-20 active devices. With smart-home gear, phones, TVs and voice assistants, a modern household passes that threshold quickly. Symptoms: random slowness, devices disconnecting for no reason.

3. Bad placement. A box inside a closed TV cabinet, on the floor, or against an outside wall serves the street rather than your living room. WiFi propagates poorly downwards and hates metal and water (aquariums, water heaters, mirrors).

4. Non-WiFi interference. Microwaves, baby monitors, analogue cameras and Bluetooth speakers all emit in the 2.4 GHz band. Weather radar can force a 5 GHz channel change (DFS) with a drop as a result.

5. Line or ISP problem. Throttled speeds, sync drops, slow DNS: WiFi is innocent, but it gets the blame. Hence the importance of the wired test before any conclusion.

Before buying anything, measure. Four simple tests are enough to isolate the cause:

• Wired reference test: a computer plugged into the box via Ethernet, speed test. That's your baseline — WiFi will never beat it. Bad over wire = line/ISP problem.
• WiFi test next to the box: two metres away, line of sight. Good here but bad elsewhere = propagation problem. Bad even here = radio equipment or saturation.
• Channel analysis: a WiFi analyser app (free on smartphones) shows neighbouring networks and their channels. If yours is crowded, changing it takes two minutes in the box interface.
• Continuous ping during a drop: ping the box and an external site. If the box answers while the external fails, the drop comes from the line, not the WiFi.

Note the results room by room, and hour by hour if the problem is intermittent: that data turns "it works badly" into an actionable diagnosis — for you or for the technician.

From simplest to most involved:

• Reposition the box: elevated, unobstructed, central to the living area, away from metal and interference sources. It's free and often spectacular.
• Change channel: on 2.4 GHz, pick the least crowded of 1, 6 and 11. On 5 GHz, prefer a non-DFS channel if drops coincide with automatic changes.
• Split the bands: naming the 2.4 and 5 GHz SSIDs differently lets you force important devices onto the fast band.
• Update the firmware of the box and restart problem devices (some cling to a distant access point).
• Offload the network: rarely used devices (old tablet, secondary TV) consume airtime even when idle — remove them or wire them.

What these fixes won't solve: structural dead zones (walls, floors) and chronic under-capacity. There, you need properly placed, cabled access points — the full approach is in the coverage guide.

Three situations justify an intervention: the diagnosis eludes you (contradictory symptoms, unexplained drops despite the tests), the stakes exceed comfort (payment terminals, intensive remote work, video surveillance, premises open to the public), or the solution requires works (cabling, ceiling access points, outdoor coverage).

A professional intervention always starts with measurement: room-by-room signal mapping, interference survey, load analysis. It ends with verified numbers — measured speeds at the critical points, before/after. For recurring faults in businesses in Nice, Cannes or Antibes, we offer a free initial diagnosis leading to a precise action plan, which you can then implement with us through our WiFi installation service or on your own.