MSSQL Problems

I've written a script that works perfectly for almost ten times, and then stops being able to connect to the MSSQL server. I imagine this has something to do with me not properly closing my connection, and the server having a maximum # of connections. I'm calling both mssql_free_result() and mssql_close() after every query. I'm using mssql_pconnect. I would include sample code, but it does this whether I use code ripped right from examples and docs or I write it myself. It doesn't seem to matter what database, or the type or amount of information I'm requesting. Thanks for any help I get on this problem, it's driving me nuts.