Hi,
Any time I have this sort of behavior on any of my sites it's nearly always been down to over-optimization for the targeted keyword. Looking at your site you've got 'oak flooring' absolutely everywhere - in URL, Titles, bold text, links, image Alts and headings. Looks over the top to me and I suspect this might be to blame.
Problem is it's not always that easy to correct quickly - you might fall before you improve if you reduce optimization.
Just my thoughts - good luck !
