I have a few websites, and yesterday again after I put 4 new articles that I let somebody write for me (100% original), I get Google dance again. The site I updated yesterday was #15 on a very high competition KW (0.99 (= 99%) competition in G-KW tool), today I could not find it in top 50. Last time my site was dancing and after 2 weeks I gained 2 spots, another time it just jumped on place in SERP. Usually after an update it dances for 1-2 weeks afterwards I gain a few spots. No linkbuilding, only adding good quality content every time.... Does anybody else also have this problem happening to their sites? I really do not understand this? Can somebody explain this?