My AC is all F'd up.  If i leave it on "auto" that's when I get problems.  It'll run cold out the top and hot by the feet...when its 95 outside.  That's not right.  
To bypass, I manually select the dash airflow only...then it cools fine.  As long as I don't use the Auto feature at all, it's fine.
As for why yours/mine is going crazy?  I have no idea.  I wish I knew but something tells me I'd have to replace the whole unit and I aint paying for that.  I've checked the outside air temp sensor and I know it's not that.  I wonder if it's a service bulleting computer update that need to be done.  HAven't had a chance to dig into it.