Could be a manufacturer defect in the tablet. Could be a problem associated with that precise model. Could be the outlet to which you plug it in. If you have used, say, the outlet by your bed this whole time, perhaps you could have an electrician evaluate your wiring. Many older dwellings have substandard wiring for the power needs of today’s technologies. A friend of mine bought a 60 yr old house 6 yrs ago. Unfortunately he had to invest a substantial amount of money in replacement of out outdated, unsafe wiring. I would contact the company that makes both the tablet and the charger. They may have run across this before, and present advice, or suggestions. Good luck.