There is something called a communication and document management software that can help evade problem that every manager faces in work life. Tasktrek is one such recommended software that helps simplify work, encourages seamless communication, formulates standards or templates for team members to follow, minimizes communication channels to cut the clutter and keeps you updated anytime and anywhere. Other basics such as delegation of task, monitoring and reporting are other important in-built tools of this software.

This question popups so many times that even 10k answers won’t be sufficient. I will only say: Document everything that you communicate with your client and yes, communicate with your client.
Communication is the best possible remedy to NOT spoiling your project and relationships with your client.
Points that we follow at work:
1. Atleast reply to your [...]