Intermittent Payment error message

While try to process credit card payment receive the below message.  Few minutes later and sometimes it works and sometimes it doesn’t.

Checked with network team and 3rd party payment processor - no downtimes and card works later, unable to find the root cause.

APP-IEX-240781. A Cash Receipt could not be created because of communications error. Please make sure you have the correct system set up and resubmit the request at a later time. Authorization of credit card trascation failed.

Any inputs appreciated..

Yogesh