VPS Server is being overloaded by PHP requests

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Tech support tells me server is running fine and that it is massive amounts of PHP requests using all the server memory...does this make sense. I am running APC for caching PHP.

New site has been working fine for a couple weeks and all of a sudden got "Unable to connect to database. A database error occurred while processing this request." Running the lastest version of C5.

Please Help!

pritcharddigital