i have a 1998 honda civic ex and lately it has been shifting roughly so i took it in and the mechanic said it was called hardshifting! what do u guys know about it and is it common? he told me most hondas have that problem...iso i had him change the trans fluid to this specifically honda made fluid and it seemed to be doing better but now and then i can feel it shifting hard...what are the solutions for this problem? is it going to damage my transmission

please help
thanks