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🔍 What it means:

This message appears when your device (typically a Ubiquiti AP or other 5GHz Wi-Fi device) is operating on a DFS (Dynamic Frequency Selection) channel.

DFS channels require your device to scan for radar signals before broadcasting — this is called a DFS Pre-Scan.
During this scan, certain features like AirView (the spectrum analyzer) are temporarily disabled.

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✅ How to fix it:

Option 1: Wait for the DFS Pre-Scan to finish
• The DFS scan usually takes 1 to 10 minutes.
• Once it completes and no radar is detected, AirView will be enabled again.

Option 2: Switch to non-DFS channels

If you need AirView immediately:
1. Log in to your device or controller interface (UniFi Controller, or device Web UI).
2. Go to the Wireless Settings.
3. For the 5GHz band, manually select non-DFS channels only (like 36, 40, 44, or 48).
4. Save the changes.
5. Reboot the access point if needed.

Note: DFS channels include 52–144. Non-DFS channels are safer for tools like AirView and provide instant startup without delay.

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🧠 Extra Tips:
• In some regions, regulatory laws require DFS usage — disabling them may limit your frequency options but will keep tools like AirView available.
• DFS is used to avoid interference with weather radar and aviation equipment.

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Let me know your exact device model, and I can give you step-by-step visuals or configuration help if you’d like!