How do I fix Wi-Fi that only gets slow at night?

When Wi‑Fi only gets slow at night, the usual causes are Wi‑Fi congestion, other devices using bandwidth, or ISP peak-time slowdown.

Try this in order:

1. Test Ethernet at night.

   • Fast on Ethernet, slow on Wi‑Fi = Wi‑Fi interference or channel congestion.
   • Slow on both = likely your ISP or line issue.

2. Switch to 5 GHz or 6 GHz if your devices support it.
   These bands are often less crowded than 2.4 GHz.

3. Change the Wi‑Fi channel.

   • On 2.4 GHz, use 1, 6, or 11.
   • If your router allows it, pick a less crowded 5 GHz channel instead of Auto.

4. Cut down nighttime traffic.
   Pause streaming, game downloads, cloud backups, and updates.
   Use QoS if your router has it.

5. Check with your ISP.
   If wired speeds also drop every evening, ask about local congestion or a line problem.

Extra tip: If the router is far away or behind thick walls, moving it or adding a mesh node can help more than changing settings.