I know that this is probably already been address but.....
Do you have the humidity function on your stat enabled? That would cause problems as well.
remote sensor requires twisted pair of wiring. Now, the question is do you have an outdoor temp sensor or an indoor temp sensor.
I fully support the military and the War on Terrorism.
If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.
If you do know, then do. But do it right. Otherwise, you may not be doing it long.