Who says it is a problem or is consuming resources? Max wait of zero means there was a maximum wait of zero seconds. Are you experiencing performance problems?

SQL*Net message from client
Although this is an idle event, it is important to explain when this event can be used to diagnose what is not the problem. This event indicates that a server process is waiting for work from the client process. However, there are several situations where this event could accrue most of the wait time for a user experiencing poor response time. The cause could be either a network bottleneck or a resource bottleneck on the client process.