Recently I am noticing that my Apple Pencil 2 is draining really quickly when it's not in use. I usually keep the pencil off charger until I need to charge it. Two times now I've gone to use it and it's at 0%. I checked the battery in the morning and at night on a day where I didn't need to use it, and it went from 67% to 34% battery. This seems abnormal. When I first got the pencil it would last a few days, but at this rate it barely makes it 2 days. Is there something wrong with my pencil?