Touch ID and battery issues after iOS update

again after the latest iOS update on my iPhone 6s, the Touch ID won’t start/work and the battery drains very quick. the first time this happened months ago I took it in and they wanted to the Phone, next iOS update fixed it. I just did the latest iOS update and boom, back to not working. I know it’s not hardware since it happens with the iOS updates and I try eveything I can find to get the Touch ID working again. Any new ideas?