Still curious if you've tried booting your phone into safe mode and looking at your performance there. This is a significant data point, if your performance problem is fixed by disabling all the apps that you've added.
To boot your phone into safe mode, first press the "power" button until the usual three button "power off/restart/emergency mode" menu appears on the screen. Then long press the "power off" button until it turns into a "safe mode" button. Then tap the "safe mode" button, and your phone will boot into safe mode. You'll see that the apps that you installed are disabled, and the ones that came with your phone will still be available. Now you can run experiments in that controlled environment to see what's causing your problems.
For example, if the performance is still bad after doing a full factory reset and manually restoring your apps and settings, then that's a data point. If you then boot your phone into safe mode, and the performance is still bad after eliminating all the apps that you've installed, then I'd be looking for an RMA. If the performance is okay in safe mode, then you know that you're having a problem with an app or a combination of apps.
The idea is to change as little as possible at a time, to try to isolate the cause of your problems. I think that the way that I'd approach this at this point is to do a full factory reset, and look at the performance before adding any apps (essentially equivalent to safe mode). If the performance is okay, then add in apps one by one and look at the performance each time. Yes, it takes some time, but if you are careful and thorough, and change as little as possible after the factory default reset, you should reach a point where your performance is back to being poor, and that last thing that you did had something to do with it *smile*.
I wish you luck, but if you need an RMA, you need an RMA. But first you need to do what you can to eliminate other possibilities. Otherwise, when you get your RMA phone it'll end up in the same state.
08-06-2018 04:32 PM