GT-N5100: Random apps crashing suddenly.

So, I got this problem with my Android GT-N5100 (running Android 4.4.2). It keeps crashing apps suddenly and randomly. I flashed it with Samsung's official firmware and since then it keeps like that. I know that if I factory reset it, it's gonna be happening the same way.

I was thinking about flashing Cyanogenmod but my device is currently unsupported. That is.. There are only nightly builds available for it at this moment, and it takes too many hacks to do so, then I'm not risking it. I thought also that it could be a memory overflow problem... Maybe.. But every time I open the window manager it seems to have plenty of memory left. I use to kill apps to avoid that, but no matter what... You got it.

Would someone PLEASE link me to a stable firmware free of bugs like that or tell me what the hell is going on and how can I fix this problem??

I'm tired of it... Believe me.