One of my ad at Google adwords, the average daily click was about 280 clicks per day and the CTR% was about 25%, very stable and average since 6 months ago. But last few days, the clicks was drop to about 80, yesterday more worst, only 19 clicks and about 7% CTR%. Unbelievable!!! I check there if any new competitors, but no, I still in average first place and actually there was only my ad with this keyword. Can somebody tell me if there have any others reason? Thanks and have a good day to everybody!