Problem only exists when 3.0 flash drive is directly attached to the router. Using extension cable solves this issue. There isn't any problems with 2.4Ghz band now. Cheers!

@Kevin_Z yes, everything is working fine without the USB flash drive. I'm using channel 6 on 2.4Ghz band /width 20Mhz/ and don't have disconnections from my devices.

@ZebraMilk did you resolve your problem? I have exactly the same issue with this router and it was caused by USB 3.0 flash drive attached to the router. It causes interference with the 2.4Ghz band....

Thanks for the info! This was causing me a lot of trouble and i believe this would be very helpful for many other people too. Cheers!

One of the many problems I'm facing with this router... I found that plugging of USB 3.0 Flash drive /made by Kingston/ is causing immediate dropping of devices connected to 2.4Ghz band. In my phone...

I have exactly tge same issues. Even with the last firmware 1.1.1