WCF Proxy Sigleton causing server problems

I have an application with around 250 concurrent users using the application daily.
I created a singleton class that instanciate the service client for ease of use: 

1 public class Proxy : CRMServiceClient, IDisposable
2 {
3 private static CRMServiceClient svc;
4
5 private Proxy() { }
6
7 public static CRMServiceClient Service
8 {
9 get
10 {
11 try
12 {
13 svc = new CRMServiceClient();
14
15 if< ...