Network connection issues while transferring files

hi, i got my new WD TV Live Hub a while ago and i’ve some issues about transferring the files… i connect my WD through ethernet cable to my modem and start transferring files generally between 15-20 gb at one time but during the transfer i generally lose my internet connection  and my modem starting over again like i turned it off and then on again. if im lucky it doesnt happen when i start transferring over again for the 2nd time. i think that its not about my WD but about my modem or internet connection. Can anybody help me to understand where the problem is? Thanks…

Hi there!  Well, can you please post the model and brand of your modem/router? This will be the first step!