Cannot save my simulations
 

Hello,
I am using Ansys 14.0.
When I try to save a simulation (no matter if its solved or not) I get the message:
Primitive Error at Node x: Buffered write, in function distribute_random: unable to realloc memory (2500000000 bytes) for mem_buf-->mem_buckets.
where x is from 0 to 3 (as I run the simulation on 4 Cores).
To my PC specs: I have an Intel i7-7700K, 64GB RAM and like 500GB of free space.
What could be the reason? How can I fix it?
Any suggestion?
-FFD