Site will not load after adding RSS Feed Reply to topic

When I Add some RSS feeds my site will not load at all, will eventually display "A database error has occurred" or Gateway Time-OUT
forcing me to go into MySQL database and delete entries in table cms_syndicated_news_sites for the RSS Feed.

In only happens with some feeds

Example of working feed:
forums.daybreakgames.c.../index.rss

example of feed that Breaks my Site:
forums.daybreakgames.c.../index.rss

and

forums.daybreakgames.c...tes-live.6

Any Idea what may be causing this ?