I’m a small internet business owner and my website is feetrelief (.com) Buy Arch Supports Foot Supports & More . I mainly sell arch supports augmented with some other foot care products. I have been in business for 11 years and have some very strong inbound links. If you go to Google and type in “arch supports” (without the quotations and in plural) I rank number one and have for some time. If you type in “arch support” (singular and again without the quotations) I have typically ranked number four. Recently (the last six to eight weeks…give or take) I have seen my ranking for “arch support” (singular) disappear completely and then reappear 4 to 5 days later while “arch supports” maintains its ranking consistently. Generally the disappearance happens over the weekend and only through the weekend but some times it extends to Monday or Tuesday. Eventually it returns (as it has tonight) but then it disappears again. I have strong ranking for other arch support related key words such as spenco arch supports, superfeet arch supports, Lynco arch supports, Sof Sole arch supports etc… and these rankings never seem to change but “arch support” ranking seems to disappear and reappear. Does anyone have any thoughts on why this happens?

Sincerely and appreciatively,

David