Permanent blank screen?

Unknown

So a bit after the latest patch, I went for a Lightning Round match, but I had to pause midway through it and then forgot about it. A couple or so hours later I come back, finish the match and get a black screen.
I figured it was because the LR had actually ended by the time I finished the match, so I closed the game and restarted it, but nothing was happening. No loading, no light, no colour no absolutely nothing happening on the screen, it was utterly blank.
Tried restarting it, tried waiting a day or two and it's still like this.

What should I do? Should I uninstall and install it again? I'm afraid I might lose my roster/account if I do that.

Edit: Forgot to mention device I play on: LG Nexus 4 (Android).