AIF Invalid message schema.


I am using Standard Item and Product AIf services to insert Item. I am using Dotnet assembly to convert XML in to AIF readable XML and using File adopter. And using outbound pipeline transform to add tags in generated response.

Issue I am facing is My port works fine for few hours it transforms xml properly and inserting Item properly. After few hours AIF service giving error for Malformed schema and giving error for invalid message schema. If I deactivate and again activate port same xml works. If anybody faced this kind of error please let me know what you have done to resolve this.

Thanks in advance.