Apps not running in the background in Android 10

So, my phone received the Android 10 update about a week ago. Now, I don't know how to explain the issue, so please bear with me. Ever since the update, the moment I minimize an app for even a second, and open it again, it starts at the loading screen. I've tried everything. I've cleared up my phone, I've turned off battery optimization for all apps, but nothing has helped. Can someone please help me figure out what's going on? I'll be really grateful.