Battery & Apple music

Hey hey,

1. My battery is being a bit weird lately, I had 19 percents and the moment I connected it to the charger its jump to 25 percents. And during the day it's losing battery really fast, any ideas? I'm running iOS 11.3 beta 3 and the battery health is at 87% which looks ok (the phone is a year and a half old, iPhone 6s)

2. Apple music, from time to time differents songs gets fade and I cannot choose them, but if I'm listening on shuffle those songs play flawlessly.

(the only solution I found is deleting the song and download them again, which is pretty annoying.)

Both problems happened before I joined the beta program.

Thanks in advance.