Crash upon some actions & weird graphics

I was not playing much for a time, and when i decided to get back, the game seems to be crashing way more than before (at least for me), and sometimes i see this as well:

I was gonna take a screenshot of a structure with the same visual, the game froze for about ten seconds, after that got back to normal and crashed. The game itself don't seems to lag, just when i get near a place with many things, like a base, but this is normal to me, but seeing the items like this it was rare, until recently.

I don't know if this have do to with the game, maybe is just my computer in the verge of death.