Since the output showed an Error 0, the issue is likely that a WRITE was issued and the Windows TCP drivers indicated they could not accept the data since all its internal buffers were full.
PxPlus will automatically retry the send up to the time limit set in the WRITE directive or if no TIM= option is specified whatever is set in the 'DT' system parameter or 30 seconds if that is not set.
Generally this means you network (or server) is overloaded.
You try increasing the allowable retry interval eithe by changing the WRITE directive or changing the system 'DT' parameter.
Mind you, if you have not specified a WRITE timeout delay and the buffers are still full after the default of 30 seconds, increasing the timeout is only going to make your end-users wonder if the system is hung and potentially cause you further trouble.