[DFS radar]Radar found on channel 104,what does this means

[mastervisa30]

This morning i lost connection to internett on my satellite in my bedrom,when i logged in to my router checked my loggs i found this [DFS radar]Changing to DFS channel 132, Thursday, January 04, 2018 03:22:50
[DFS radar]Radar found on channel 104, Thursday, January 04, 2018 03:22:47
[DFS radar]Changing to DFS channel 104, Thursday, January 04, 2018 03:18:18
[DFS radar]Radar found on channel 120, Thursday, January 04, 2018 03:18:15.

what does this means

[guzzijason]

Here's a summary:

http://wifi-insider.com/wlan/dfs.htm