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There are a few possibly reasons why you may be seeing the same issue after a factory reset. The first possibility is that you allowed the apps to automatically reinstall and one of them is causing high system use. Another possibility is that the system is struggling with a corrupt SD card, yet another possibility is that you have a WiFi connection issue causing the system to struggle. Last on my list is that most Android devices will show Android services using more resources, battery, than anything else and what you are seeing is not abnormal.i have the same problem, and guess what , factory reset didn't solve it.
There are a few possibly reasons why you may be seeing the same issue after a factory reset. The first possibility is that you allowed the apps to automatically reinstall and one of them is causing high system use. Another possibility is that the system is struggling with a corrupt SD card, yet another possibility is that you have a WiFi connection issue causing the system to struggle. Last on my list is that most Android devices will show Android services using more resources, battery, than anything else and what you are seeing is not abnormal.
In your case, because of the problems you're having, I'm fairly certain one or more of the apps you installed is causing the problem. There are some apps that are very poorly designed. Another factory reset without installing more than one or 2 apps at a time and then testing it should pinpoint the offending app(s).
It's not easy. I would start by installing gsam battery monitor to find out what, besides the Android OS, is consuming your battery. You could do what I suggested with the reset, or selectively uninstall some apps.