I'm using s9 plus too... so you can do one thing- go to settings- device maintenance and then click on battery option and then click on battery usage...it will show you which app is causing the draining of your phone's battery and you can rectify the problem by deleting that app
Thank you for reaching out to the Samsung community! We would recommend you to follow some troubleshooting steps in order to further isolate what you may be experiencing in your device. Find the troubleshooting steps on the provided link http://www.samsung.com/in/support/skp/faq/1101689. Please let us know what steps you have taken and if you have noticed any changes or improvements as this will help the Community to provide you further troubleshooting steps without repeating any procedure which you may have already followed.
We would like to inform you that a software update has been released in August for S9+ device. Check for the software update notification by using Smart Switch PC suite as well. You need to download the PC Suite from below link: http://www.samsung.com/in/support/smartswitch/
Note: Don’t disconnect your mobile phone from PC at the time of software installation.
Be sure to hit ♡ when you find an answer that works for you. For further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
