Oreo first impressions

Since the update my battery life has gone down. The battery drains quicker, and it charges more slowly unless I'm plugged into the original fast charge charger, which wasn't the case prior. It also keeps giving me a device maintenance notification saying an app is overloading the system naming "system_server" and when I allow it to close the problem app it just restarts my phone.
Have you found a fix? I have this problem on my Note 8 on T-Mobile and my battery only lasts 9 hours now.
 

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