Losing 275-ish clicks per day in most niches might not be noticeable, but setting that aside, what's more important is earnings. Have earnings dropped?
Here are some possible causes:
Third party code is constantly changing, particularly Social Media plugins and AdSense. A change to one can cause AdSense ads to stop functioning properly. Typical malfunctions include losing the ability to be clicked to a distorted and unattractive display.
- Device incompatibility - your site
Your site could be displaying in a distorted and unattractive manner, causing visitors to back out. Check your analytics and review your time on page type stats.
Device incompatibility - ads
Ads might not be showing on certain devices or clashing with site design, resulting in less clicks. Check your analytics for devices used to access your site then troubleshoot those devices.
This is a big one, often relating to CSS or coding errors. Many templates are sloppily coded to work well in Apple devices but not across the range of Windows based devices, despite the best intentions of the designers who may have tested their work in browser/OS emulators. For example, failure to properly display in IE 8 is practically endemic to WordPress templates. This is not limited to WordPress. Check your analytics to see what browsers/OS combinations are popularly being used to access your site and troubleshoot. Also run your code through the W3C Validation Checker.
Are all of your server, CMS, and add-on/mods patched and up to date?
- An advertiser backed out. A provocative high click (and possibly low paying) ad might have dropped out.
- An ad at the top of the page is attracting more attention.
- Season/event driven clicks dried up at the end of season/event