Hello. I use a52s and its awesome phone with awesome performance. The only hardware problem its screen flickering.
If u having battery drain put phone on airplane and charge it without using it. Pretty sure u will see difference on 🔋
I would let a Samsung Experience Store / Samsung Service Centre take a look at the screen flickering issue your experiencing.
In regards to battery drain.
Look at your Device Care Section to see what's using your battery so you can act against any obvious apps that are using high amounts.
Personally I'm not keen on turning features and functions Off as I want to use these that are useful to me.
I turn Off Improve Location Accuracy.
I put apps to sleep that I dont always need to work in the background and always send me Notifications, and some apps to deep sleep that I dont need to work in the background and send me Notifications until I launch that particular app.
Setting sync schedules can help and I've heard Bixby routines can help.
Dark Mode, Dark Wallpapers can save a little amount of battery as less pixels are lit up.
I also found that Google Chrome uses alot of resources so I disable that and use Samsung Internet instead.
I also uninstalled the Facebook App and now access this via my browser's Url.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb.
Samsung Gear s³ Frontier Watch.
Samsung Galaxy Watch⁴ Classic.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.
Screen flickering only happens when i make call or i receive a call. So solution is to disable animated Call background. I puted custom wallpaper and now issue its gone