carbon seat post to carbon seat tube - necessary to loosen periodically to prevent seizing in place? I recently (about 4 months ago) purchased a bike with a carbon frame (i.e. carbon seat tube) and a carbon seat post.  I've read some nightmare stories about having to replace an entire carbon frame in some cases when the seat post gets severely stuck to the seat tube.

When I first received my current bike (to reiterate, carbon seat post and seat tube) after I positioned the seat I used carbon assembly paste between the seat post and tube so as to prevent any temptation to overly tighten the seat post clamp bolt.  From what I've read, carbon assembly paste is generally recommended for carbon on carbon seat posts and also stems to carbon handlebars.

The carbon assembly paste seems to hold the seat post in place great, I don't have to overtighten the seat post clamp bolt at all and the seat has never slipped.

My concern now is, how do I know the seat post and seat tube won't freeze together over time?

I use my bike for communing daily and keep it in my apartment at night, but it does have to stay outside on a bike rack (through all seasons in Michigan) during the day.

Is it recommended every so often (ex. once every month, or some other time frame?) to loosen and move the seat post to prevent freezing?  Or is there some other recommended measure I can take to prevent freezing?  I would prefer to continue using the carbon paste unless this is likely to cause a freezing problem.
A carbon seatpost will not freeze in a carbon tube much unlike metal to metal contact. So there is no need for the procedure you envisioned.

Using the carbon paste is highly recommended in your situation and also with metal/carbon contact. However you should never ever use any kind of grease or fat which might damage carbon components.

Consider investing in a torque wrench because it is near impossible to 'measure' the correct value with the wrist-o-meter. The recommended applicable torque is often printed on the clamp, like 3-5Nm. You should apply the lowest value first and increase the torque only of the post slips.