I agree, take it to an expert. It is very common for any automatic to slip when its cold due to the oil level being low. Even .5 of a liter can present problems. This happens because the oil is low when it is cold, but as it heats up it expands and can then reach a level where the unit will often operate normally until it cools down again, eg overnight. ALWAYs seek advise when an automatic transmission slips in any shape or form. Its is very easy to burn out a multi-clutch in a few minutes if allowed to slip even for a short time ( a few minutes can be enough) Regards Pete :D