Its looks it called “DFS channels” and they are like this on 2,4 GHz and 5 GHz wifi.
Thats are channels, which used by flight radar or weather radar or like this by air planes. Depend on low of some country’s, the use of by wifi also used related channels, have priority for use by airplane and temporary disabled by DFS certified routers.
It can be, gl router don’t have a DSF certification. See follow statement from gl:
Its looks like wifi related DFS channels are:
| Band | DFS | Channel | Frequency (MHz) |
|---|---|---|---|
| U-NII-1 | 36 – 48 | 5170 – 5250 | |
| U-NII-2A | DFS | 52 – 64 | 5250 – 5330 |
| U-NII-2C | DFS | 100 – 140 | 5490 – 5710 |
| U-NII-3 | 149 – 165 | 5735 – 5835 |
Source: How to Use DFS Channels in WiFi
If you configure on your router (p.e. on advanced admin menue of gl router) and / or your PC, to use only channel which will be disabled by a DFS compatible device if a airplane fly over you, you will lost your wifi connection. Thats are the roules. Check the configuration of your devices.