I did this. Phone was working better for a few days and now it is back as usual. It might be an app that I installed but how am I going to isolate the culprit (battery saver doesn't tip me off). I'd love if the diagnostic app allowed us to view processes running
Like I said, if you are experiencing this issue, you should not install all your apps at once. Install three or four at a time, use it for a day or two and then, if everything is still working fine, install the next batch.
Start with the most important apps first, and work your way through. It's not a huge pain, but it isn't exactly user friendly either. I know.