As far as the accidental turn on in your pocket if you go to,
Settings > Display > Accidental touch protection and enable if not already..
As far as the battery drain on standby mode..
I activated Bixby routines for when I'm at work ect and it puts my device into medium power saver with adaptive power save and I end the day after quite intensive use between 5-11pm with at least 40% and that's on optimized power too. High performance leaves me with about 20% around 11pm.