Fix Wi-Fi That Slows Down Only at Night

The key insight most people miss: if your Wi-Fi is only slow at night, the problem is almost certainly not your router — it's network congestion from your neighbours. Between 7–11 PM, everyone on your block is streaming Netflix, gaming, and video calling simultaneously, which saturates the shared neighbourhood infrastructure your ISP uses. Your router hardware is likely fine.

Diagnose First (Free, 5 Minutes)

1. Run a speed test at speedtest.net — once at 3 PM and once at 9 PM. If both are slow, the problem is your router or device. If only the evening one is slow, it's congestion.
2. Open your router admin panel (usually 192.168.1.1 or 192.168.0.1) and check what channel your 2.4 GHz Wi-Fi is on. Channels 1, 6, and 11 are the only non-overlapping ones.
3. Check if the slowdown affects all devices or just one. One device = device problem. All devices = ISP or router problem.

Free Fixes (Do These First)

1. Switch your Wi-Fi channel manually. Log into your router, go to wireless settings, and change from "auto" to a specific non-overlapping channel (1, 6, or 11 on 2.4 GHz). "Auto" lets routers fight over the same crowded channels at night.
2. Force devices to 5 GHz. 5 GHz is less crowded than 2.4 GHz in most neighbourhoods and has more non-overlapping channels. If your router broadcasts both, connect all devices capable of 5 GHz to that band.
3. Restart your router and modem at 6 PM daily. Many ISPs throttle connections that have been up for days. A timed outlet can automate this.
4. Enable QoS (Quality of Service) in your router settings. This prioritizes streaming/gaming traffic when bandwidth is scarce.

If the Problem Is Your ISP (Congestion)

1. Call your ISP and report slow speeds specifically during evening hours — mention the speed test results with timestamps. ISPs are legally required in Canada to investigate. This alone sometimes triggers a fix.
2. Ask about switching from cable (shared bandwidth) to fibre optic — fibre is dedicated bandwidth per home and doesn't suffer neighbourhood congestion. Bell Fibre and Rogers Ignite Fibre are available in many Canadian cities.

If the Problem Is Your Router

1. If your router is 4+ years old, it may struggle to manage traffic when multiple devices are active simultaneously — which peaks at night. A Wi-Fi 6 or Wi-Fi 6E router handles congestion dramatically better due to OFDMA technology (serves multiple devices simultaneously instead of queuing them).
2. Consider a mesh network system if you have a large home — dead zones force devices to cling to a weak signal, which tanks speed.

Pro tip: Download the Wi-Fi Analyzer app (free on Android) and run it at 9 PM. It shows every nearby network and what channel they're on — you'll visually see the congestion. Then switch your router to the least-used channel. This single free change can recover 30–50% of your evening speed.