Windows XP client is unstable connects and access data/documentation on file server 2003 while windows 7 client still connect normally

Dear ITs Pro,

At the moment, i'm encounter the issue that Windows XP clients is unstable connects and access data/documentation on file server 2003 while windows 7 clients still connect normally. So sometimes our productions is delays. Who's can help me to check and resolving the issue, thanks in advance!