Weird connection problems to analysisserver

I have a large scale web application which connects to a an analysis server.

I didn't have any issues so far but now, only when I am debuging, I get this:

to connect to ssas I use the following method, all the time:

        private static SSAS.Server AnalysisServerConnect(String strStringConnection)
        {
            Microsoft.AnalysisServices.Server svr = new Microsoft.AnalysisServices.Server();
            try
            {
                svr.Connect(strStringConnection);
            }
            catch (SSAS.AmoException e)
            {
                Logger.Exception(strStringConnection, e);
                throw e;
            }
            catch (Exception e)
            {
                Logger.Exception(strStringConnection, e);
                throw e;
            }
   return svr;

}

Now this function succeeds on some cases and fails on others with no specific reason why.

with the same connection string        

for instance, I call it once and it works, call another function and the a few lines later call it again and it fails.

nothing in the code has changed btw

The error:

A connection cannot be made. Ensure that the server is running. and the server is running 

and inner exception of:

No such host is known

the ssas is running for sure. also used sql profiler to see if the failed attemp to connect reaches the server and it doesnt.