Hi guys. I somehow found a solution for the issue relating to faction wars crashing in Mortal Kombat.
It works like this. After getting to the survivor battle mode you are about to play, and it crashes when searching for opponent, relaunch the game and go back to the same difficulty mode you are about to play. It would have found the opponent and it won't crash this time. It only crashes the moment it searches for your opponent.
Play the battle. Since the major crashing issue is searching for opponent, switch off data or WiFi before it could search for the next opponent. After losing connection, switch data back on and it will show connection error and fail to process searching for opponent. It would have searched for it but you don't allow it to finish the process. This way, it won't crash.
Just go back to the battle and it would have searched for the opponent already, without crashing. Repeat the process until you are through with the survivor difficulty battles you are playing. You do the same for other difficulties. Just follow up with the process and it won't crash. Hope this helps.