All the keywords Contain "Watch" out from the google search results.?

I have so many sub-domains on tv shows that are listing top 10 on google search engine on both keywords "download (tv show name)" and "watch (tv show name)" But a week before all the "watch" keywords from all the tv shows go far behind in google search results but not the download. how can be it happen. Is that Google Penalize My sub-domains on some specific keywords?