We've noticed something along those lines. We didnt have it loaded and nothing would be craftable. Somethings like fences couldnt be placed. No errors or any indication of what's going on. The time in between is intermittent as well, it will just break at random.
We're running on my home pc.
Windows 7 64 bit ultimate
Amd Phenon 2 X6 2.6ghz
12 gb ram