2,4 GHz network disappeared after USB disk connect

[mariokil]

Hi Team,
Last weekend I connect USB drive to router (RT-AC86U with latest Merlin firmware; USB 3.0 port) and run dlna.
Unfortunately 2,4 GHz network has been unreachable from other devices. 2,4 GHz network was not shows on the list on other network devices. I reseted router to factory defaults but it not helped.
Have you meet similar behaviour ? Is it bug or feature ?

Regards

 

[jsbeddow]

USB 3.0 ports are known to "potentially"cause radio interference on the 2.4Ghz band, try moving your flash drive to the USB 2.0 port, or set both ports to USB 2.0 mode in the GUI.