I have a 2009 Galant Es with 66k miles. I've had it aligned 3 times in the last 8 months and it just has a hollow sound while driving. Any ideas on what could be causing the alignment to keep falling out of whack? I've had no accidents or anything.

 

The sound has nothing to do with a bad alignment. Unless the car is pulling...

Either you struck a curb and the hub is damaged, or a wheel bearing has failed.

 

The car is pulling to one side. Ugh. It's really frustrating. Are the hub or bearing issues super expensive to repair?