PI - 7.0 Cache can't get updated on every dialog instance

Hi all

We just encountered a problem when we got a new interface online in production. Everytime we send messages throungh that interface, some message process successfully and some are not, the error is 'CO_TXT_OUTBINDING_NOT_FOUND'. I have checked the interface object in Integration Repository and Directory, everything resides in it. We got 4 dialog instance for our system, and we found that everytime the message processing in dialog 1 and dialog 2 the error occurs, dialog 3 and dialog 4 works fine, guess this is the cache problem. I have done CPA Delta cache refresh, but the problem still exists.

Can anyone help me solving this problem.

Best Regards