Hello, my problem here: I just created a new campaign on Jun 4th, and for the first and second days, one particular keyword is generating quite a lot of impressions and clicks, and the CTR is good. However, today I found that there's ZERO impression for that particular keyword. Just very curious about it. Anybody has any ideas? My guess is that someone new coming in has taken my position. But why there's not a single impression? Should I raise the bid?