does my icline freezer have a problem?

Have just been given iceline chest freezer. when i first switched it on it dropped to operating temp very quickly, which i presume is a good thing. but when i put food in it (it is just less than half full) it seems to be taking an absolute age to get back down to operating temperature. how long should it be before it is at operating temp with food in it. The temp is dropping albeit rather slowly. do i need to worry?