A router may switch channels automatically or move from a DFS channel after radar detection; that is not always a hardware fault.
Before you change anything
This is a diagnostic entry point. The source supports the general check, not a confirmed root cause for your device.
What to check first
Does another compatible client see or join the same SSID and band?
Record the exact model, hardware revision, firmware and recent change before adjusting settings. If you cannot answer the question, keep the cause open.
Narrow the likely path
| Observation | Next check |
|---|---|
| SSID is missing | Check radio, band, client support and whether the network is hidden. |
| Password is accepted then rejected | Compare WPA mode, saved profile and client capabilities. |
| Internet works but local device fails | Inspect guest isolation and whether both devices share the same LAN. |
Decision after the first test
Record band, channel and time in the router log. Compare actual dropouts before forcing a fixed channel.
Use a documented next step
Verify before escalating
After each change, repeat the exact failed task. If the result is unchanged, restore the previous setting and use the official support link for your exact hardware revision. Don’t assume a menu or capability from a related model.
Official sources
- TP-Link US channel, channel width and DFS explanation (full_text; checked 2026-11-01)
Check your exact US model, hardware revision, and firmware on the linked support page before changing settings.