I have lately had problems with one of the enterprise accounts that I´m working on. The company has several sites where I have included a standard google search. As the company has an enterprise account with Google, it should allow up to 100,000 clicks/day, but it redirects all domains after only 2500 clicks to a standard output. Does it have to do with the fact that all domains access through one IP address? Even though, there should not be 100,000 clicks/day for all domains.