Auto Trans

Recently(10 days) had auto trans on 2001 SATURN SC2 rebuilt at 108K. Now I notice, after 600 miles, (1) Happened only 3 -4 times — harder, than normal- downshift from 3rd to 2nd when slowing from hi speed AND (2) Only happened twice – when slowing to turn corner or slow for traffic (did not stop) and when I reapplied gas it sounded/felt like I was going over gravel (gears slipping??) Do I need to have auto trans adjusted or do I need another rebuilt trans??