I suddenly experienced the same problem- unable to charge using the Samsung cable. It's a new cable and it charges my phone just fine. I plugged my computer charger into the tablet (it's a 65W USB-C charger) and it's charging the tablet well. I hate to use the computer charger for that but it's an easy fix and I can buy another one from Amazon for about $25. I don't know why this would suddenly happen but at least I have a fix that seems to be working.