[FS#458] WNDR3700v4 5G Wireless Band B not working

[LEDE Bugs]

The following task has a new comment added:

FS#458 - WNDR3700v4 5G Wireless Band B not working
User who did this - Arjen de Korte (arjendekorte)

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In pretty much the whole of Europe (which includes GB), usage of the 5 GHz bands is governed by the EN 301 893. This standard states

4.2.6.1.2 DFS applicable frequency range 
Radar detection shall be used when operating on channels whose nominal bandwidth falls partly or completely within the frequency ranges 5 250 MHz to 5 350 MHz or 5 470 MHz to 5 725 MHz. This requirement applies to all types of RLAN devices regardless of the type of communication between these devices.

Note that in some cases, the mandatory DFS detection may also be triggered by another WLAN device transmitting in the 5 GHz range (it may err on the side of caution). This is not a bug but intentional behavior and as it also did this before, I doubt there is anything you can do about this (other than switching to a different channel with less interference).
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=458#comment1557