Because your work spills over into your speech

You’re a telephonist. When you talk to people outside work, you sound abrupt.

Or you’re a teacher. When you talk to people outside work, you sound didactic.

Or you’re a police officer. When you talk to people outside work, you sound domineering.

Or you’re an executive. When you talk to people outside work, you sound like you’re making decisions.

Or you work with the very young. When you talk to people outside work, you use only short words.

Or you work with the very old. When you talk to people outside work, you talk too loudly.

You’re not sure what happened.

You don’t sound like yourself any more.