I'm farming on level 6.3 with good endless research. While playing there my game also often crashes once per game when a lot of fighters are dying (not every or first time when fighters die!), but this wouldn't be worth reporting because I can simply restart Infinitode 2 and load the newest safe (wich can be annyoing when the safe was done a longer time ago).

But the real reason for this report is: When a game on 6.3 ends (I play 90% on 6.3 so this could be a coincidence), the game is stuck at the 'base is full' screen with the zooming to the base (the screen right before the end screen with the rewards). After like a minute the game finally crashes. When restarting Infinitode 2, I can see no rewards (even the inventory is the same like before playing the game), the continue button doesn't work (because there is no game to continue) and the statistics only show previos played games but not the one when it crashed.
This means when this happended I have wasted almost 15 minutes for NOTHING.