In this case, I don't see any evidence of front-running. It's more likely that it's a coincidence that someone registered the domain name a day after you searched for it. In fact, I personally would consider that to be more of a 'premium' domain, so it's logical that someone simply also searched for it and bought it.
Personally, when I search for domains, and it's available, I usually just register it and don't wait. I only wait and not register it right then and there if I'm OK with not getting it.