soytali Please post on Answers HQ, specifically in this master thread:
https://answers.ea.com/t5/Bug-Reports/How-to-fix-EA-app-Error-500/td-p/12170106
This forum is still new and doesn't have an EA App forum, so support and info gathering for App-specific issuesare still only at AHQ.
Having said that, it's always helpful to try a different network. For example, if your computer has wifi, you could set your phone as a mobile hotspot, using data rather than your home network. It shouldn't take much data to login to the App, and you can then put it in offline mode if you're worried about it eating into your data allowance.