At our Jacksonville Beekeepers meeting last night, I was talking to a fellow member and he had the same problem. Our club apiary also had the same problem, we re queened all of the hives per the Ag center request (they paid for them, hives are on city property) and 2 of them lost there queens within a couple of weeks. Both of them made there own queens. I had one swarm that I saw the Q a week after putting it in a hive. For the next 3 weeks I had real sparse brood, no eggs but I still ended up with Q cells. I could not find the queen. I have left that one alone, except to peek under the top and look through the screen, to give the new Q a chance to mate, before I check it again.