hello . its not a USB cable problem. ive got 6 different chargers, 3 or which are genuine samsung, i have an external charger, and a genuine in car carger, the whole lot of them dont work, they all used to work fine, now none do. it was plugged in for 7 hours to the mains whilst switched off, and it wouldnt go over 80% charged, and would drain quite fast once swiched on. this past saturday i bought a genuine battery. it worked fine for 2 days, then it stopped charging again, and if you use it while its plugged in the battery would drain, not charge. its only 8 months old, ive taken it back to my provider for repair now