Some games and apps are pretty much doing that as in most probability they may not be well enough optimized for low memory devices. I'm a regular user of 'hungry shark evolution' and the game has always been crashing on my 520 past many updates whether it's mounted on Sd card( class 10) or phone. Heck, even doodle jump crashes, but asphalt 8 never crashes, as does dungeon hunter 4 or AOE. So, I guess, this is an app thing. Either the app has to be well optimized for 512 MB RAM devices or the RAM is to be improved and needless to say windows on phones is going the latter way with even the 435 getting 1 GB RAM.