The best way to fix it is to turn it off, take the back off, unplug the battery for a few minutes, plug it back in, and restart the device. I was going to buy a new battery, watched a YouTube video on how to do it. I practiced by unplugging the battery before I bought a new one. After my practice run, my Note 8 has worked great with no battery issues. I plan to do that occasionally just for maintenance! Saved me from buying a battery!