Its bound to happen, most places prefer employed optoms to locums. Happened to me a few years ago, I had three regular days at the same place, for about 2 years, then was replaced by a pre reg. Made good business sense for the practice, and I treated myself to a month off work, and havent been short of work since. The whole point of being a locum for me is that I am free to work when I like, for whom I like, without explanation or argument, but its a two way street. We are valuable because we can be there when needed and dont need to be paid for when we are not needed.