Resolução de problemas de Wi-Fi: um guia prático

Before changing settings, get a baseline. Run our Teste de Rede para verificar sua velocidade de download, latência e jitter. Anote os números e compare-os após cada correção abaixo para saber o que realmente ajudou.

1. Reinicie seu roteador e modem: desconecte ambos por 30 segundos, conecte o modem primeiro, espere um minuto e depois o roteador.
2. Reinicie o dispositivo com problemas, metade dos problemas persistentes de Wi-Fi são causados por uma pilha de rede travada no dispositivo, não na rede.
3. Verifique se outros dispositivos na mesma rede têm o mesmo problema. Se apenas um dispositivo estiver com dificuldades, a falha é local a ele.
4. Aproxime-se temporariamente do roteador para descartar distância e interferência.
5. Verifique a página de status ou aplicativo do seu provedor de internet (ISP) para saber sobre interrupções conhecidas em sua área.

Isso significa que seu dispositivo tem uma conexão com o roteador, mas o roteador não tem internet ou não a está transmitindo.

1. Verifique se outros dispositivos na mesma rede Wi-Fi conseguem navegar. Se nenhum conseguir, o problema é o roteador ou a conexão do provedor, não o seu dispositivo.
2. Observe as luzes do modem, uma luz sólida de "internet" ou "online" deve estar acesa; piscar ou estar apagada geralmente significa ausência de sinal do provedor.
3. Tente conectar um computador diretamente ao modem com um cabo Ethernet, ignorando o roteador completamente, para isolar se o problema é o roteador.
4. On Windows, run Settings > Network & internet > Status > Network troubleshooter.
5. No macOS, mantenha a tecla Option pressionada e clique no ícone do Wi-Fi na barra de menu para ver diagnósticos detalhados, ou abra o Diagnóstico Sem Fio pelo Spotlight.

Suspeite de falha de hardware quando:

• As luzes do roteador mostram um padrão de erro de hardware (verifique o manual para saber o que uma luz vermelha ou piscando repetidamente significa no seu modelo específico).
• Uma redefinição de fábrica e atualização de firmware não mudam nada, e o problema persiste em todos os dispositivos conectados.
• O roteador tem mais de 4-5 anos e tem dificuldades mesmo com poucos dispositivos conectados, hardware antigo simplesmente não consegue lidar com cargas de tráfego modernas e padrões de Wi-Fi.
• Se um dispositivo específico não consegue obter um bom sinal em toda a casa enquanto outros funcionam bem, a antena ou adaptador Wi-Fi desse dispositivo pode ser a verdadeira falha, não a rede.

Se você isolou o problema na sua conexão com o provedor de internet (ISP) em vez de no seu próprio equipamento, entre em contato diretamente com eles; nenhuma quantidade de solução de problemas do roteador irá corrigir uma falha na parte deles da linha.

Slow Wi-Fi is really three distinct faults with three different fixes, and treating them as one problem is why so much troubleshooting goes nowhere. The first is low bandwidth, where pages load but large downloads crawl. The second is high latency, where bandwidth looks fine but everything feels sluggish and video calls stutter. The third is instability, where speed is fine most of the time but the connection drops repeatedly.

Measure before you change anything. Run a speed test next to the router and again where you actually use the device. A big gap between the two means a coverage problem inside your home, which no amount of contacting your provider will fix. Similar numbers in both places mean the incoming connection itself is the limit, and that is a conversation with your provider rather than a router setting.

Wi-Fi is radio, and radio is defeated by physics long before it is defeated by hardware. A router in a cupboard, behind a television, on the floor, or in a corner of the house is working against every law of signal propagation. Moving the same router to a central, elevated, open position frequently doubles usable coverage without spending anything.

• Concrete, brick and anything containing metal or water absorb signal heavily, including mirrors, radiators, fish tanks and foil-backed insulation.
• Every floor between the router and the device costs roughly as much signal as a thick wall.
• Microwave ovens, cordless phones and older baby monitors interfere directly with the 2.4GHz band.
• Keep the router at least a metre from other electronics and never inside a metal enclosure.
• If coverage still fails at the far end of the house, a mesh system beats a repeater, because repeaters halve throughput on the band they retransmit.

Most routers broadcast on both 2.4GHz and 5GHz, and newer ones add 6GHz. They behave very differently. 2.4GHz travels further and passes through walls better but carries less data and is heavily congested in flats and terraced housing. 5GHz is much faster with far less interference but loses strength quickly through solid walls.

• Use 5GHz for laptops, phones and streaming devices in the same or an adjacent room as the router.
• Use 2.4GHz for smart home devices, garden cameras and anything at the far edge of coverage.
• If both bands share one name, a device may cling to the weaker one, temporarily splitting the names helps diagnose it.
• On 2.4GHz choose channel 1, 6 or 11, they are the only three that do not overlap each other.

When a connection degrades gradually over days, the cause is usually accumulated state in the router rather than anything you did. A structured restart clears it properly, and the order matters.

1. Power off the modem and the router, and unplug both at the wall.
2. Wait a full sixty seconds so capacitors discharge and the provider releases the session.
3. Power the modem on first and wait for its lights to settle completely.
4. Power the router on and wait a further two minutes before testing.
5. Run a speed test from the same spot each time so you have comparable numbers over weeks.

Keep a short log of results with dates. If your provider disputes a performance problem, a series of timestamped measurements from the same location is far more persuasive than a description, and it also reveals patterns such as slowdowns only during evening peak hours, which point to network congestion rather than anything in your home.

Intermittent network problems are difficult to fix precisely because they are gone by the time anyone looks. A short written record turns a vague complaint into evidence, and it often reveals the cause on its own once a pattern appears.

• Test from the same two places each time, next to the router and where the problem occurs.
• Record download speed, upload speed, latency, the time of day and which band you were connected to.
• Note anything unusual, a new appliance, a neighbour's new router, a firmware update or a house full of guests.
• Test both wired and wireless where possible, the difference separates your home network from the incoming line.
• Keep at least a week of readings before drawing conclusions, single measurements mislead constantly.

With that record, decisions become straightforward. Consistent shortfalls on a wired connection belong to your provider, wireless-only shortfalls belong to placement and interference, and problems confined to particular hours point to congestion that no equipment change will remove.