Why do my local network ip addresses keep changing?

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ThreadAuthorDate ()
M+-\joe@actionline.com
||.MStephen
||.MEric Shubert
||.M-\Tim Bogart
||.M\|Alex Dean
||.||MTim Bogart
||.|MTim Bogart
|M\|Brian Cluff
||M|Brian Cluff
|M||Tim Bogart
||M|Tim Bogart
||.MEric Shubert
|MTim Bogart
|MEric Shubert
|Mjoe@actionline.com
MJohn