[FS#506] BT Home Hub 5: 5g WiFi jumps to channel 36 and stops working if stopped and restarted

[LEDE Bugs]

The following task has a new comment added:

FS#506 - BT Home Hub 5: 5g WiFi jumps to channel 36 and stops working if stopped and restarted
User who did this - Mauro Mozzarelli (ezplanet)

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This happens also on a WNDR3700v4:

Configure Atheros AR9580 802.11an (radio1) to a Band B Channel (100-140)

Use a WiFi scanner like Android WiFi Analyzer to scan WiFi channels.

The router will be initially on the configured channel. After a few minutes it will jump to Channel 36 (Band A). /etc/config/wireless remains untouched to the original channel only the radio will be on channel 36. On reboot it will take the configured channel on Band B (eg Ch 104) correctly, but it will jump to Ch 36 again after a few minutes.

The router will take the configuration for any Band B Channel, but it will not appear at all. Only if configured on a Band A (ch 36-64) it will appear on the radio waves. 

Also in this case if I disable and re-enable the device it will not work. A reboot is required to restore service.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=506#comment1771