EA App Instability with Sims 3

Ever since the change from Origin to the EA App, I've had consistent issues with the management of my Sims 3 and all of it's DLC, store content etc.

1. I'm regularly having to re-enter my in game settings, from ages, to seasons, to time format.  This is a constant issue since the change to the EA App.
2. Twice now, none of my DLC towns have been properly installed.  I should only have to install this content once.  The EA App should not be allowed to make changes to my saved game content such as DLC and Sims 3 Store content.  The missing DLC includes as above, towns, certain premium items etc and causes a 'serious error' when loading a town which is in any way reliant on DLC I'm unaware has suddenly been either disconnected or uninstalled from my game.
3. I have been getting prompts to 'Register' my Sims 3 game with Origin, which I did ages ago.  If I close this window, as I'm no longer using my physical discs for gameplay, it aborts the starting of the game.

I'm honestly sick of this App, the fact that we're forced to use it rather than simply installing all of our owned merchandise onto our PCs and being able to start the game with the launcher, allowing us to bypass this abysmal PC app.

Please fix the stability of this app with regard to already installed games, in particular the Sims 3.  You've made a mess of it and the game costs, in total, a fortune.