Use unique and descriptive TITLE tags across all pages of your site, because duplicate Titles may cause problems with site indexing and rankings. As an option, you may leave the duplicate TITLE tags intact but use a "canonical" attribute on the non-canonical pages to let the search engines know which one is the preferred page
Since the Title tags are the most important parts of a web page for both the user experience and search engine optimization, it is highly necessary to avoid duplicate Title tags across your website. The Google Panda update fights against low quality content across the Web and the first thing they consider is whether a site has duplicate Title tags on many of its web pages. It's a sign of sloppy coding at best and spamming at worst.
Investigate your website for duplicate Title tags and rewrite them to make them unique and descriptive. Pay special attention to your landing pages - pages that are most likely to attract searchers in the SERPs and convert them into clients.
Example of how many pages could be effecting your rankings and costing you visibility.