trans shifting problem
 

i have a 2010 elentra gls with about 53k on it I have been have a shifting problem since about 10k it slips, and shifts very hard sometimes. I have had it at the dealer for this a number of times. they have done updates for the trans but have not been able to fix it. There are no codes in the system. I am wondering if anyone had a simialar problem or any ideas of what it could be?
Thanks

I also am experiencing the same issues for a 2010 Hyundai elantra with 54k on it. Any feedback would be appreciated it seems to have very intermittent.