Hello,

I have the same type of keyboard Logitech K400 and after months of struggling with the Beebox ports, I cracked the problem. Here's how my system is connected: on front port the USB 3 HDD enclosure (on the back ports it only works on USB2 for some reason) on the back I have the Logitech unifying receiver and the webcam. I run Ubuntu 16.04 on it. Whichever port I used (even the one on front), I could not go further away that 2 meters from the receiver, otherwise the K400 keyboard would lose connection.

I decided to install a powered USB hub that I had laying around in the house but I wanted to put it further away and I got a USB 2 extension cord. Then I thought to myself, why not put the receiver in the extension cord and put it on top of the TV just for testing purposes? After I did that, I could control my Beebox from the next room! So in my opinion, there is something that interferes with the 2.4GHz signal from the receiver. No idea what it is, because I took out the wifi card a long time ago, I use wired connection for file sharing and seafile server. And for further testing, I used the 3cm extension that Logitech provides with the keyboard, it works with that too in the front port, only 3 CM away from the unit is enough to make it run very smooth from over 5m away!

BTW I have N3150 CPU with a mSATA 32GB as main drive, not too fancy but it runs KODI, SEAFILE, SMB and VPN like a dream, with 2xHDD over USB3 for storage. I can even play back 10bit HEVC 1080p movies without stuttering.