u do not need to unplug to do the glitch, but i am assuming that ur talking about the smuggling part.
for the smuggling part, just make sure u do it really fast, since u have succeeded once, that means ur on the right truck, all u need to do from now on is to do the smuggling part faster, It usually took me less than 5 second to do it. but if u get dced in 5 second, try to do it faster, like less than 3 second.