Some sources of difficulty by the speaker in the listening process are:
Message with many unnecessary details, forgetting the point or the purpose of the interaction.
Paying too much attention to how the other person is taking the message, or how the person might react, and the speaker gets distracted from being objective delivering the message.
It occurs when the speaker says something with technical details, and the other side does not understand / know what is being said.
Voice too low, or the speaker has articulation problems.
