Problems with ASUS RT-AC88U

[MdRS]

My Router seems to have little LAN random disconections that affects to the acces to the disks that i have connected via USB 3.0

The problems that i see is .when i'm using Utorrent, that donwloads directly to the disks in the router, it loses conection to the disks randonmly.
The other problem is when i use DNLA and watching some media it randomly cuts the video and i see that the logo of asus have dissapeared and reapears in seconds.

The steps i have done:

-- Have changed the USB 3.0 cable and nothing
-- I have updated the firmware to the last firmware of ASUS and nothing
-- I have updated to the last Merlin firmware but nothing

I don't know what to do and it gets me the nerves, because the last video I have seen this problems happened four times, making it an irritating problem.

Thanks a lot for your help in advance