Im not sure how best to explain this, so stick with me.
I have a Raspberry 2 running Raspbian, updated with the new GUI and whatnot. All seems good with it initially, I can do whatever it is I need to do, but after a time, usually a day or two, the system becomes unresponsive. I can't SSH to it for one. And from directly on the Raspberry, the GUI seems to still be functioning, but I can't open a terminal, and if I try to open the "start" menu, it will hang for a few seconds, then the GUI will disappear, reappear, and I will be back where I was before... which is nowhere.
I've encountered this problem using several different SD cards, different physical raspberries, and the only thing that was consistent between them all was the image I used, however, I've used this image on several other raspberries with success.
I am a novice at best with this kind of thing and I wouldn't be surprised if I just did something stupid. Laymans terms would be appreciated.