I have the same problem (s9+ snapdragon). Try uninstall updates for Device Health Services app from Google Android do not update It from play store. I did this yesterday and my battery life improves a lot. Sot and sleeping.My battery life has gone to absolute piss since the update. I can barely get through a working day now and end up throwing it on the charger as soon as I get home from work.
Enviado de meu SM-G9650 usando o Tapatalk