I have one campaign with 200 or so ad groups that send about 1000 visitors per day on good days (low volume keywords). The problem I have is my traffic fluctuates between 400-1100.

I check from previous days and don't see any keywords becoming inactive. I just see a lower number of impressions. It seems weird because I will have 4-5 days where I see consistant 900 clicks, them boom I get 400 for no apparent reason.

Any ideas?