I have recently bought a third party USB cable. I am still using the original wall adapter that I got. Now, I noticed that while charging, it sometimes makes the "plugged in" sound as if I had just plugged in the cable onto my phone. It does that several times randomly and I thought I just hadn't plugged it in correctly, but I've checked and that is not the case? Is there a problem with NON-Samsung USB cables (if such thing even exists)? The phone does charge, it never stops charging, but it makes that notification sound as if I had just put it to charge, even though it has been charging for some time already.