Mine has not in the 4 years I have been making it I still have a sample from my first batch and every now and then I pick it up and shake it to see if there is any fall out there is none and it is still a nice crystal clear golden baby shampoo yellow.
Those of you who are interested in making colloidal silver would be well advised to go to the GIM forums:
Discussions/Coffee Shack/Alt Medicine/Colloidal Silver/the Art of Making Colloidal Silver Thread
It has been going for over three years and is approaching 20,000 views. Be sure to start from the beginning. It will be worth your while.