first excuse me my ugly english.. I target a very samll niche with total 50 searchs PER day. I set my Adwords aount 2 months ago, 14 keywords, 5 get QS 10/10 and the other 7/10. it works well, and had a 12% Click rate, but today when i check again , two keywords fall to 7/10, why a keywords with monthly QS 10 fall to 7 now? any suggestions ?
Things in Adwords are very dynamic. Did you really expect things like prices and QS to remain where they were? Your QS is recalculated after every search. Some advertisers will go up, others go down. You have just been outperformed by your competitors. You need to try to outperform them once again with better ads. Learn more about QS.