my octoplus box seems kind of warm

I have an octoplus pro.. activated on Jtag Samsung and LG

if i connect the box seems kind of warm i have 8 box of diffrent brands or name and never experience this...
that the box itself is kind of warm even if I am not using as a Jtag
using samsung features only or even its just attach to my computer?

Is this normal? I only experience this on this box...