Drive shaft cat sx

[Malek]

I noticed that on my cat sx that my wheels where wobling to much i checked my tires re-balanced them to make sure they where ok and i was still gettingthe woble in my wheel when i was holding the cat up.Then i realized that the drive shaft wasn't moving straight at all...I changed the drive shaft with a new ones and it fixed my wobling problem but after a few runs i noticed it happening again not much but it was getting worse...Is there anything i am doing wrong here or do the drive shafts bend after a few runs? even some new drive shafts i bought looked bent when i was running them in the car.This creates to much vibration in the car.