90 model mercedes 300sl trannie problem

Problem with 90 model Mercedes 300 sl automatic transmission 722-500 5 speed. This transmission starts off in second gear then shifts 3-4-5 if selector is in D range. Problem I am having is long 2-3 shift cold. After transmission finally makes 2-3 shift all other shifts seem to be fine. Now here is the CATCH even after unit is warm, turn key off just for 1-5 minutes, then start the engine and long 2-3 is right back until transmission shifts to 3rd then transmission shifts okay again. Any help n solving this problem would be greatly apprciated. Thank you.