So you're saying that your other not original cable sometimes work, sometimes not? It might mean that you need to replace that usb socket. It might be damaged inside, so not every cable can connect nicely, as not every microusb plug is the same (they should be, but they are not, sadly). Try to look inside this socket and see if you can see something that looks not as supposed to be, or maybe some dust or lint stuffed inside, so plug can't go inside all the way in.