@Spectro: Is the screen going black while you're interacting with your A52 5G and, if so, are you using a particular app or feature when the issue occurs? If you tap the Power/Side Key when the screen turns off, does this power the display back on? To troubleshoot the issue, please try pressing the Volume Down and Power Keys together for around 10 seconds until the phone restarts. Don't worry, this won't affect your personal data or settings. Now, head to Settings > Display > Screen Timeout, and increase the time (max 10 minutes) to see if you notice an improvement.
I Appreciate you not wanting to perform a factory reset @Spectro
It's a last resort and make sire to perform back ups too.
Some generic troubleshooting tips are....
- Https://www.samsung.com/uk/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/ turns off downloaded apps and themes etc which may highlight an app or theme that's causing conflict.
- Https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may need to insert your earphones or hook upto a powered On Laptop to access the Clear Partition Section. This may help with lag or stutters as this clears the phone of old/unused or broken cache files.There is also a Repair Apps option in the Menu System too.
- Settings > General Management > Reset > Reset All Settings.
- Your sim card maybe conflicting with the phone. Can you test it in another phone.
- Look at using the diagnostic tool in your Samsung Members App too please.
- A Samsung Experience Store or Samsung Service Centre can check out the phone too.
I wish you all the best. 
